256371653 has 4 divisors (see below), whose sum is σ = 261208908. Its totient is φ = 251534400.

The previous prime is 256371637. The next prime is 256371667. The reversal of 256371653 is 356173652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 234487969 + 21883684 = 15313^2 + 4678^2 .

It is a cyclic number.

It is not a de Polignac number, because 256371653 - 2⁴ = 256371637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256371613) 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, 2418548 + ... + 2418653.

It is an arithmetic number, because the mean of its divisors is an integer number (65302227).

Almost surely, 2^256371653 is an apocalyptic number.

It is an amenable number.

256371653 is a deficient number, since it is larger than the sum of its proper divisors (4837255).

256371653 is an equidigital number, since it uses as much as digits as its factorization.

256371653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837254.

The product of its digits is 113400, while the sum is 38.

The square root of 256371653 is about 16011.6099440375. The cubic root of 256371653 is about 635.2675442752.

The spelling of 256371653 in words is "two hundred fifty-six million, three hundred seventy-one thousand, six hundred fifty-three".