133397457 has 4 divisors (see below), whose sum is σ = 177863280. Its totient is φ = 88931636.

The previous prime is 133397443. The next prime is 133397479. The reversal of 133397457 is 754793331.

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 133397457 - 2⁴ = 133397441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133397417) 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, 22232907 + ... + 22232912.

It is an arithmetic number, because the mean of its divisors is an integer number (44465820).

Almost surely, 2^133397457 is an apocalyptic number.

It is an amenable number.

133397457 is a deficient number, since it is larger than the sum of its proper divisors (44465823).

133397457 is an equidigital number, since it uses as much as digits as its factorization.

133397457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44465822.

The product of its digits is 238140, while the sum is 42.

The square root of 133397457 is about 11549.7816862484. The cubic root of 133397457 is about 510.9548394213.

It can be divided in two parts, 1333 and 97457, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 133397457 in words is "one hundred thirty-three million, three hundred ninety-seven thousand, four hundred fifty-seven".