257426213 has 4 divisors (see below), whose sum is σ = 280828608. Its totient is φ = 234023820.

The previous prime is 257426209. The next prime is 257426233. The reversal of 257426213 is 312624752.

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 257426213 - 2² = 257426209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 257426213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257426203) 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, 11701181 + ... + 11701202.

It is an arithmetic number, because the mean of its divisors is an integer number (70207152).

Almost surely, 2^257426213 is an apocalyptic number.

It is an amenable number.

257426213 is a deficient number, since it is larger than the sum of its proper divisors (23402395).

257426213 is a wasteful number, since it uses less digits than its factorization.

257426213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23402394.

The product of its digits is 20160, while the sum is 32.

The square root of 257426213 is about 16044.5072532627. The cubic root of 257426213 is about 636.1373898893.

The spelling of 257426213 in words is "two hundred fifty-seven million, four hundred twenty-six thousand, two hundred thirteen".