257250621 has 4 divisors (see below), whose sum is σ = 343000832. Its totient is φ = 171500412.

The previous prime is 257250611. The next prime is 257250659. The reversal of 257250621 is 126052752.

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 not a de Polignac number, because 257250621 - 2⁵ = 257250589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257250601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42875101 + ... + 42875106.

It is an arithmetic number, because the mean of its divisors is an integer number (85750208).

Almost surely, 2^257250621 is an apocalyptic number.

It is an amenable number.

257250621 is a deficient number, since it is larger than the sum of its proper divisors (85750211).

257250621 is an equidigital number, since it uses as much as digits as its factorization.

257250621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85750210.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 257250621 is about 16039.0342913780. The cubic root of 257250621 is about 635.9927192513.

The spelling of 257250621 in words is "two hundred fifty-seven million, two hundred fifty thousand, six hundred twenty-one".