133551913 has 4 divisors (see below), whose sum is σ = 145693008. Its totient is φ = 121410820.

The previous prime is 133551911. The next prime is 133551919. The reversal of 133551913 is 319155331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133551913 - 2¹ = 133551911 is a prime.

It is a super-2 number, since 2×133551913² = 35672226931919138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133551911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6070531 + ... + 6070552.

It is an arithmetic number, because the mean of its divisors is an integer number (36423252).

Almost surely, 2^133551913 is an apocalyptic number.

It is an amenable number.

133551913 is a deficient number, since it is larger than the sum of its proper divisors (12141095).

133551913 is a wasteful number, since it uses less digits than its factorization.

133551913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12141094.

The product of its digits is 6075, while the sum is 31.

The square root of 133551913 is about 11556.4662851583. The cubic root of 133551913 is about 511.1519686182.

The spelling of 133551913 in words is "one hundred thirty-three million, five hundred fifty-one thousand, nine hundred thirteen".