256198087 has 2 divisors, whose sum is σ = 256198088. Its totient is φ = 256198086.

The previous prime is 256198057. The next prime is 256198133. The reversal of 256198087 is 780891652.

It is an a-pointer prime, because the next prime (256198133) can be obtained adding 256198087 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256198087 - 2²⁷ = 121980359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256198057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128099043 + 128099044.

It is an arithmetic number, because the mean of its divisors is an integer number (128099044).

Almost surely, 2^256198087 is an apocalyptic number.

256198087 is a deficient number, since it is larger than the sum of its proper divisors (1).

256198087 is an equidigital number, since it uses as much as digits as its factorization.

256198087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 256198087 is about 16006.1890217503. The cubic root of 256198087 is about 635.1241512268.

The spelling of 256198087 in words is "two hundred fifty-six million, one hundred ninety-eight thousand, eighty-seven".