257251111631 has 2 divisors, whose sum is σ = 257251111632. Its totient is φ = 257251111630.

The previous prime is 257251111583. The next prime is 257251111693. The reversal of 257251111631 is 136111152752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257251111631 - 2²² = 257246917327 is a prime.

It is a super-2 number, since 2×257251111631² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257251111591 and 257251111600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257251111331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128625555815 + 128625555816.

It is an arithmetic number, because the mean of its divisors is an integer number (128625555816).

Almost surely, 2^257251111631 is an apocalyptic number.

257251111631 is a deficient number, since it is larger than the sum of its proper divisors (1).

257251111631 is an equidigital number, since it uses as much as digits as its factorization.

257251111631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 35.

The spelling of 257251111631 in words is "two hundred fifty-seven billion, two hundred fifty-one million, one hundred eleven thousand, six hundred thirty-one".