256322511 has 12 divisors (see below), whose sum is σ = 386341488. Its totient is φ = 163451904.

The previous prime is 256322501. The next prime is 256322543. The reversal of 256322511 is 115223652.

It is a happy number.

256322511 is a `hidden beast` number, since 2 + 5 + 632 + 25 + 1 + 1 = 666.

It is not a de Polignac number, because 256322511 - 2⁷ = 256322383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256322501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 618930 + ... + 619343.

It is an arithmetic number, because the mean of its divisors is an integer number (32195124).

Almost surely, 2^256322511 is an apocalyptic number.

256322511 is a deficient number, since it is larger than the sum of its proper divisors (130018977).

256322511 is a wasteful number, since it uses less digits than its factorization.

256322511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238302 (or 1238299 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 256322511 is about 16010.0752965125. The cubic root of 256322511 is about 635.2269517575.

The spelling of 256322511 in words is "two hundred fifty-six million, three hundred twenty-two thousand, five hundred eleven".