256324861 has 16 divisors (see below), whose sum is σ = 293482224. Its totient is φ = 221773824.

The previous prime is 256324853. The next prime is 256324879. The reversal of 256324861 is 168423652.

It can be written as a sum of positive squares in 8 ways, for example, as 2528100 + 253796761 = 1590^2 + 15931^2 .

It is a cyclic number.

It is not a de Polignac number, because 256324861 - 2³ = 256324853 is a prime.

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 256324861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256324841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54541 + ... + 59053.

It is an arithmetic number, because the mean of its divisors is an integer number (18342639).

Almost surely, 2^256324861 is an apocalyptic number.

It is an amenable number.

256324861 is a deficient number, since it is larger than the sum of its proper divisors (37157363).

256324861 is a wasteful number, since it uses less digits than its factorization.

256324861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800.

The product of its digits is 69120, while the sum is 37.

The square root of 256324861 is about 16010.1486876294. The cubic root of 256324861 is about 635.2288930343.

The spelling of 256324861 in words is "two hundred fifty-six million, three hundred twenty-four thousand, eight hundred sixty-one".