257426137 has 4 divisors (see below), whose sum is σ = 257517540. Its totient is φ = 257334736.

The previous prime is 257426123. The next prime is 257426153. The reversal of 257426137 is 731624752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123121216 + 134304921 = 11096^2 + 11589^2 .

It is a cyclic number.

It is not a de Polignac number, because 257426137 - 2⁷ = 257426009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257426096 and 257426105.

It is not an unprimeable number, because it can be changed into a prime (257426107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41338 + ... + 47155.

It is an arithmetic number, because the mean of its divisors is an integer number (64379385).

Almost surely, 2^257426137 is an apocalyptic number.

It is an amenable number.

257426137 is a deficient number, since it is larger than the sum of its proper divisors (91403).

257426137 is an equidigital number, since it uses as much as digits as its factorization.

257426137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91402.

The product of its digits is 70560, while the sum is 37.

The square root of 257426137 is about 16044.5048848508. The cubic root of 257426137 is about 636.1373272870.

The spelling of 257426137 in words is "two hundred fifty-seven million, four hundred twenty-six thousand, one hundred thirty-seven".