256613371 has 4 divisors (see below), whose sum is σ = 293272432. Its totient is φ = 219954312.

The previous prime is 256613353. The next prime is 256613387. The reversal of 256613371 is 173316652.

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 256613371 - 2⁵ = 256613339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256613311) 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, 18329520 + ... + 18329533.

It is an arithmetic number, because the mean of its divisors is an integer number (73318108).

Almost surely, 2^256613371 is an apocalyptic number.

256613371 is a deficient number, since it is larger than the sum of its proper divisors (36659061).

256613371 is an equidigital number, since it uses as much as digits as its factorization.

256613371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36659060.

The product of its digits is 22680, while the sum is 34.

The square root of 256613371 is about 16019.1563760393. The cubic root of 256613371 is about 635.4671338998.

The spelling of 256613371 in words is "two hundred fifty-six million, six hundred thirteen thousand, three hundred seventy-one".