133256957 has 4 divisors (see below), whose sum is σ = 136356000. Its totient is φ = 130157916.

The previous prime is 133256953. The next prime is 133256993. The reversal of 133256957 is 759652331.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 759652331 = 113 ⋅6722587.

It is a cyclic number.

It is not a de Polignac number, because 133256957 - 2² = 133256953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133256953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1549457 + ... + 1549542.

It is an arithmetic number, because the mean of its divisors is an integer number (34089000).

Almost surely, 2^133256957 is an apocalyptic number.

It is an amenable number.

133256957 is a deficient number, since it is larger than the sum of its proper divisors (3099043).

133256957 is an equidigital number, since it uses as much as digits as its factorization.

133256957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099042.

The product of its digits is 170100, while the sum is 41.

The square root of 133256957 is about 11543.6977178026. The cubic root of 133256957 is about 510.7753897898.

The spelling of 133256957 in words is "one hundred thirty-three million, two hundred fifty-six thousand, nine hundred fifty-seven".