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133231212 = 22323700867
BaseRepresentation
bin1111111000011…
…11001001101100
3100021200211212100
413330033021230
5233101344322
621115335100
73205306122
oct774171154
9307624770
10133231212
1169229644
1238751490
13217aa44a
14139a1912
15ba6adac
hex7f0f26c

133231212 has 18 divisors (see below), whose sum is σ = 336778988. Its totient is φ = 44410392.

The previous prime is 133231207. The next prime is 133231223. The reversal of 133231212 is 212132331.

Adding to 133231212 its reverse (212132331), we get a palindrome (345363543).

It can be divided in two parts, 13323 and 1212, that added together give a triangular number (14535 = T170).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1850398 + ... + 1850469.

Almost surely, 2133231212 is an apocalyptic number.

133231212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133231212 is an abundant number, since it is smaller than the sum of its proper divisors (203547776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133231212 is a wasteful number, since it uses less digits than its factorization.

133231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700877 (or 3700872 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 133231212 is about 11542.5825533110. The cubic root of 133231212 is about 510.7424940480.

The spelling of 133231212 in words is "one hundred thirty-three million, two hundred thirty-one thousand, two hundred twelve".

Divisors: 1 2 3 4 6 9 12 18 36 3700867 7401734 11102601 14803468 22205202 33307803 44410404 66615606 133231212