256671587 has 2 divisors, whose sum is σ = 256671588. Its totient is φ = 256671586.

The previous prime is 256671563. The next prime is 256671629. The reversal of 256671587 is 785176652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256671587 - 2¹² = 256667491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256671787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128335793 + 128335794.

It is an arithmetic number, because the mean of its divisors is an integer number (128335794).

Almost surely, 2^256671587 is an apocalyptic number.

256671587 is a deficient number, since it is larger than the sum of its proper divisors (1).

256671587 is an equidigital number, since it uses as much as digits as its factorization.

256671587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 47.

The square root of 256671587 is about 16020.9733474593. The cubic root of 256671587 is about 635.5151848611.

The spelling of 256671587 in words is "two hundred fifty-six million, six hundred seventy-one thousand, five hundred eighty-seven".