256651451 has 4 divisors (see below), whose sum is σ = 293315952. Its totient is φ = 219986952.

The previous prime is 256651441. The next prime is 256651481. The reversal of 256651451 is 154156652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256651451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256651441) 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, 18332240 + ... + 18332253.

It is an arithmetic number, because the mean of its divisors is an integer number (73328988).

Almost surely, 2^256651451 is an apocalyptic number.

256651451 is a deficient number, since it is larger than the sum of its proper divisors (36664501).

256651451 is an equidigital number, since it uses as much as digits as its factorization.

256651451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36664500.

The product of its digits is 36000, while the sum is 35.

The square root of 256651451 is about 16020.3449088963. The cubic root of 256651451 is about 635.4985656103.

The spelling of 256651451 in words is "two hundred fifty-six million, six hundred fifty-one thousand, four hundred fifty-one".