257011443 has 24 divisors (see below), whose sum is σ = 401598288. Its totient is φ = 157447872.

The previous prime is 257011439. The next prime is 257011451. The reversal of 257011443 is 344110752.

It is not a de Polignac number, because 257011443 - 2² = 257011439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257011943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21721 + ... + 31397.

It is an arithmetic number, because the mean of its divisors is an integer number (16733262).

Almost surely, 2^257011443 is an apocalyptic number.

257011443 is a deficient number, since it is larger than the sum of its proper divisors (144586845).

257011443 is a wasteful number, since it uses less digits than its factorization.

257011443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9923 (or 9920 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 257011443 is about 16031.5764352730. The cubic root of 257011443 is about 635.7955540209.

The spelling of 257011443 in words is "two hundred fifty-seven million, eleven thousand, four hundred forty-three".