257140051 has 4 divisors (see below), whose sum is σ = 293874352. Its totient is φ = 220405752.

The previous prime is 257140033. The next prime is 257140057. The reversal of 257140051 is 150041752.

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

It is not a de Polignac number, because 257140051 - 2⁷ = 257139923 is a prime.

It is a super-2 number, since 2×257140051² = 132242011656565202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257139998 and 257140025.

It is not an unprimeable number, because it can be changed into a prime (257140057) 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, 18367140 + ... + 18367153.

It is an arithmetic number, because the mean of its divisors is an integer number (73468588).

Almost surely, 2^257140051 is an apocalyptic number.

257140051 is a deficient number, since it is larger than the sum of its proper divisors (36734301).

257140051 is an equidigital number, since it uses as much as digits as its factorization.

257140051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36734300.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 257140051 is about 16035.5870176305. The cubic root of 257140051 is about 635.9015866013.

The spelling of 257140051 in words is "two hundred fifty-seven million, one hundred forty thousand, fifty-one".