256338501 has 4 divisors (see below), whose sum is σ = 341784672. Its totient is φ = 170892332.

The previous prime is 256338493. The next prime is 256338503. The reversal of 256338501 is 105833652.

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 256338501 - 2³ = 256338493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256338503) 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, 42723081 + ... + 42723086.

It is an arithmetic number, because the mean of its divisors is an integer number (85446168).

Almost surely, 2^256338501 is an apocalyptic number.

It is an amenable number.

256338501 is a deficient number, since it is larger than the sum of its proper divisors (85446171).

256338501 is an equidigital number, since it uses as much as digits as its factorization.

256338501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85446170.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 256338501 is about 16010.5746617665. The cubic root of 256338501 is about 635.2401604657.

The spelling of 256338501 in words is "two hundred fifty-six million, three hundred thirty-eight thousand, five hundred one".