256040051 has 4 divisors (see below), whose sum is σ = 256103400. Its totient is φ = 255976704.

The previous prime is 256040047. The next prime is 256040053. The reversal of 256040051 is 150040652.

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

It is a cyclic number.

It is not a de Polignac number, because 256040051 - 2² = 256040047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256039999 and 256040026.

It is not an unprimeable number, because it can be changed into a prime (256040053) 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, 25166 + ... + 33843.

It is an arithmetic number, because the mean of its divisors is an integer number (64025850).

Almost surely, 2^256040051 is an apocalyptic number.

256040051 is a deficient number, since it is larger than the sum of its proper divisors (63349).

256040051 is an equidigital number, since it uses as much as digits as its factorization.

256040051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63348.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 256040051 is about 16001.2515448011. The cubic root of 256040051 is about 634.9935320812.

The spelling of 256040051 in words is "two hundred fifty-six million, forty thousand, fifty-one".