257563631 has 8 divisors (see below), whose sum is σ = 278266800. Its totient is φ = 236987712.

The previous prime is 257563627. The next prime is 257563633. The reversal of 257563631 is 136365752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257563631 - 2² = 257563627 is a prime.

It is a super-2 number, since 2×257563631² = 132678048027808322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257563633) 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 7 ways as a sum of consecutive naturals, for example, 27581 + ... + 35718.

It is an arithmetic number, because the mean of its divisors is an integer number (34783350).

Almost surely, 2^257563631 is an apocalyptic number.

257563631 is a deficient number, since it is larger than the sum of its proper divisors (20703169).

257563631 is a wasteful number, since it uses less digits than its factorization.

257563631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63625.

The product of its digits is 113400, while the sum is 38.

The square root of 257563631 is about 16048.7890820460. The cubic root of 257563631 is about 636.2505630023.

The spelling of 257563631 in words is "two hundred fifty-seven million, five hundred sixty-three thousand, six hundred thirty-one".