255561251 has 4 divisors (see below), whose sum is σ = 278794104. Its totient is φ = 232328400.

The previous prime is 255561239. The next prime is 255561263. The reversal of 255561251 is 152165552.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (255561239) and next prime (255561263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255561251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255561281) 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, 11616410 + ... + 11616431.

It is an arithmetic number, because the mean of its divisors is an integer number (69698526).

Almost surely, 2^255561251 is an apocalyptic number.

255561251 is a deficient number, since it is larger than the sum of its proper divisors (23232853).

255561251 is a wasteful number, since it uses less digits than its factorization.

255561251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23232852.

The product of its digits is 15000, while the sum is 32.

The square root of 255561251 is about 15986.2832140557. The cubic root of 255561251 is about 634.5974682411.

The spelling of 255561251 in words is "two hundred fifty-five million, five hundred sixty-one thousand, two hundred fifty-one".