256152809 has 4 divisors (see below), whose sum is σ = 279439440. Its totient is φ = 232866180.

The previous prime is 256152797. The next prime is 256152893. The reversal of 256152809 is 908251652.

256152809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256152809 - 2²⁴ = 239375593 is a prime.

It is a super-3 number, since 3×256152809³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256152899) 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, 11643299 + ... + 11643320.

It is an arithmetic number, because the mean of its divisors is an integer number (69859860).

Almost surely, 2^256152809 is an apocalyptic number.

It is an amenable number.

256152809 is a deficient number, since it is larger than the sum of its proper divisors (23286631).

256152809 is a wasteful number, since it uses less digits than its factorization.

256152809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23286630.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 256152809 is about 16004.7745688591. The cubic root of 256152809 is about 635.0867337661.

The spelling of 256152809 in words is "two hundred fifty-six million, one hundred fifty-two thousand, eight hundred nine".