257106917 has 4 divisors (see below), whose sum is σ = 270638880. Its totient is φ = 243574956.

The previous prime is 257106907. The next prime is 257106919. The reversal of 257106917 is 719601752.

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 257106917 - 2⁶ = 257106853 is a prime.

It is a super-2 number, since 2×257106917² = 132207933538489778, 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 (257106919) 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, 6765953 + ... + 6765990.

It is an arithmetic number, because the mean of its divisors is an integer number (67659720).

Almost surely, 2^257106917 is an apocalyptic number.

It is an amenable number.

257106917 is a deficient number, since it is larger than the sum of its proper divisors (13531963).

257106917 is a wasteful number, since it uses less digits than its factorization.

257106917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13531962.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 257106917 is about 16034.5538447442. The cubic root of 257106917 is about 635.8742722147.

The spelling of 257106917 in words is "two hundred fifty-seven million, one hundred six thousand, nine hundred seventeen".