133243231 has 8 divisors (see below), whose sum is σ = 146283984. Its totient is φ = 120357120.

The previous prime is 133243223. The next prime is 133243241. The reversal of 133243231 is 132342331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133243231 - 2³ = 133243223 is a prime.

It is a super-2 number, since 2×133243231² = 35507517214638722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133243241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36850 + ... + 40303.

It is an arithmetic number, because the mean of its divisors is an integer number (18285498).

Almost surely, 2^133243231 is an apocalyptic number.

133243231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133243231 is a deficient number, since it is larger than the sum of its proper divisors (13040753).

133243231 is a wasteful number, since it uses less digits than its factorization.

133243231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77321.

The product of its digits is 1296, while the sum is 22.

The square root of 133243231 is about 11543.1031789550. The cubic root of 133243231 is about 510.7578518843.

Adding to 133243231 its reverse (132342331), we get a palindrome (265585562).

The spelling of 133243231 in words is "one hundred thirty-three million, two hundred forty-three thousand, two hundred thirty-one".