257533121 has 4 divisors (see below), whose sum is σ = 257631792. Its totient is φ = 257434452.

The previous prime is 257533109. The next prime is 257533219. The reversal of 257533121 is 121335752.

257533121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 257533121 - 2²² = 253338817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257535121) 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, 45311 + ... + 50676.

It is an arithmetic number, because the mean of its divisors is an integer number (64407948).

Almost surely, 2^257533121 is an apocalyptic number.

It is an amenable number.

257533121 is a deficient number, since it is larger than the sum of its proper divisors (98671).

257533121 is an equidigital number, since it uses as much as digits as its factorization.

257533121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98670.

The product of its digits is 6300, while the sum is 29.

The square root of 257533121 is about 16047.8385148904. The cubic root of 257533121 is about 636.2254394097.

Adding to 257533121 its reverse (121335752), we get a palindrome (378868873).

The spelling of 257533121 in words is "two hundred fifty-seven million, five hundred thirty-three thousand, one hundred twenty-one".