257541321 has 4 divisors (see below), whose sum is σ = 343388432. Its totient is φ = 171694212.

The previous prime is 257541301. The next prime is 257541331. The reversal of 257541321 is 123145752.

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 not a de Polignac number, because 257541321 - 2²¹ = 255444169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257541301) 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, 42923551 + ... + 42923556.

It is an arithmetic number, because the mean of its divisors is an integer number (85847108).

Almost surely, 2^257541321 is an apocalyptic number.

It is an amenable number.

257541321 is a deficient number, since it is larger than the sum of its proper divisors (85847111).

257541321 is an equidigital number, since it uses as much as digits as its factorization.

257541321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85847110.

The product of its digits is 8400, while the sum is 30.

The square root of 257541321 is about 16048.0939989770. The cubic root of 257541321 is about 636.2321919305.

The spelling of 257541321 in words is "two hundred fifty-seven million, five hundred forty-one thousand, three hundred twenty-one".