256154087 has 4 divisors (see below), whose sum is σ = 292747536. Its totient is φ = 219560640.

The previous prime is 256154081. The next prime is 256154117. The reversal of 256154087 is 780451652.

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 256154087 - 2¹⁰ = 256153063 is a prime.

It is a super-2 number, since 2×256154087² = 131229832573607138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256154087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256154081) 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, 18296714 + ... + 18296727.

It is an arithmetic number, because the mean of its divisors is an integer number (73186884).

Almost surely, 2^256154087 is an apocalyptic number.

256154087 is a deficient number, since it is larger than the sum of its proper divisors (36593449).

256154087 is an equidigital number, since it uses as much as digits as its factorization.

256154087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36593448.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 256154087 is about 16004.8144943951. The cubic root of 256154087 is about 635.0877899579.

The spelling of 256154087 in words is "two hundred fifty-six million, one hundred fifty-four thousand, eighty-seven".