256993051 has 4 divisors (see below), whose sum is σ = 293706352. Its totient is φ = 220279752.

The previous prime is 256993027. The next prime is 256993067. The reversal of 256993051 is 150399652.

It is a happy number.

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

It is not a de Polignac number, because 256993051 - 2⁵ = 256993019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256992995 and 256993013.

It is not an unprimeable number, because it can be changed into a prime (256993021) 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, 18356640 + ... + 18356653.

It is an arithmetic number, because the mean of its divisors is an integer number (73426588).

Almost surely, 2^256993051 is an apocalyptic number.

256993051 is a deficient number, since it is larger than the sum of its proper divisors (36713301).

256993051 is an equidigital number, since it uses as much as digits as its factorization.

256993051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36713300.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 256993051 is about 16031.0028070611. The cubic root of 256993051 is about 635.7803876005.

The spelling of 256993051 in words is "two hundred fifty-six million, nine hundred ninety-three thousand, fifty-one".