133253457 has 4 divisors (see below), whose sum is σ = 177671280. Its totient is φ = 88835636.

The previous prime is 133253453. The next prime is 133253509. The reversal of 133253457 is 754352331.

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: 754352331 = 3 ⋅251450777.

It is a cyclic number.

It is not a de Polignac number, because 133253457 - 2² = 133253453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133253453) 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, 22208907 + ... + 22208912.

It is an arithmetic number, because the mean of its divisors is an integer number (44417820).

Almost surely, 2^133253457 is an apocalyptic number.

It is an amenable number.

133253457 is a deficient number, since it is larger than the sum of its proper divisors (44417823).

133253457 is an equidigital number, since it uses as much as digits as its factorization.

133253457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44417822.

The product of its digits is 37800, while the sum is 33.

The square root of 133253457 is about 11543.5461189359. The cubic root of 133253457 is about 510.7709179044.

The spelling of 133253457 in words is "one hundred thirty-three million, two hundred fifty-three thousand, four hundred fifty-seven".