133557313 has 4 divisors (see below), whose sum is σ = 133676740. Its totient is φ = 133437888.

The previous prime is 133557301. The next prime is 133557329. The reversal of 133557313 is 313755331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6589489 + 126967824 = 2567^2 + 11268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133557313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133557353) 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, 58020 + ... + 60277.

It is an arithmetic number, because the mean of its divisors is an integer number (33419185).

Almost surely, 2^133557313 is an apocalyptic number.

It is an amenable number.

133557313 is a deficient number, since it is larger than the sum of its proper divisors (119427).

133557313 is a wasteful number, since it uses less digits than its factorization.

133557313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119426.

The product of its digits is 14175, while the sum is 31.

The square root of 133557313 is about 11556.6999182293. The cubic root of 133557313 is about 511.1588577831.

The spelling of 133557313 in words is "one hundred thirty-three million, five hundred fifty-seven thousand, three hundred thirteen".