250656421 has 4 divisors (see below), whose sum is σ = 258742144. Its totient is φ = 242570700.

The previous prime is 250656409. The next prime is 250656467. The reversal of 250656421 is 124656052.

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 a de Polignac number, because none of the positive numbers 2^k-250656421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 8085691 = 250656421 / (2 + 5 + 0 + 6 + 5 + 6 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250656481) 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, 4042815 + ... + 4042876.

It is an arithmetic number, because the mean of its divisors is an integer number (64685536).

Almost surely, 2^250656421 is an apocalyptic number.

It is an amenable number.

250656421 is a deficient number, since it is larger than the sum of its proper divisors (8085723).

250656421 is an equidigital number, since it uses as much as digits as its factorization.

250656421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085722.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 250656421 is about 15832.1325474492. The cubic root of 250656421 is about 630.5114021755.

The spelling of 250656421 in words is "two hundred fifty million, six hundred fifty-six thousand, four hundred twenty-one".