256311461 has 4 divisors (see below), whose sum is σ = 292927392. Its totient is φ = 219695532.

The previous prime is 256311457. The next prime is 256311479. The reversal of 256311461 is 164113652.

It is a happy number.

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 256311461 - 2² = 256311457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256311401) 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, 18307955 + ... + 18307968.

It is an arithmetic number, because the mean of its divisors is an integer number (73231848).

Almost surely, 2^256311461 is an apocalyptic number.

It is an amenable number.

256311461 is a deficient number, since it is larger than the sum of its proper divisors (36615931).

256311461 is an equidigital number, since it uses as much as digits as its factorization.

256311461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36615930.

The product of its digits is 4320, while the sum is 29.

The square root of 256311461 is about 16009.7301976017. The cubic root of 256311461 is about 635.2178234675.

The spelling of 256311461 in words is "two hundred fifty-six million, three hundred eleven thousand, four hundred sixty-one".