256464541 has 4 divisors (see below), whose sum is σ = 258954592. Its totient is φ = 253974492.

The previous prime is 256464493. The next prime is 256464569. The reversal of 256464541 is 145464652.

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-256464541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256464541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256464041) 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, 1244871 + ... + 1245076.

It is an arithmetic number, because the mean of its divisors is an integer number (64738648).

Almost surely, 2^256464541 is an apocalyptic number.

It is an amenable number.

256464541 is a deficient number, since it is larger than the sum of its proper divisors (2490051).

256464541 is a wasteful number, since it uses less digits than its factorization.

256464541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490050.

The product of its digits is 115200, while the sum is 37.

The square root of 256464541 is about 16014.5103265757. The cubic root of 256464541 is about 635.3442579130.

The spelling of 256464541 in words is "two hundred fifty-six million, four hundred sixty-four thousand, five hundred forty-one".