251260655 has 8 divisors (see below), whose sum is σ = 317382000. Its totient is φ = 190429056.

The previous prime is 251260649. The next prime is 251260657. The reversal of 251260655 is 556062152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251260655 - 2²⁴ = 234483439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251260657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322330 + ... + 1322519.

It is an arithmetic number, because the mean of its divisors is an integer number (39672750).

Almost surely, 2^251260655 is an apocalyptic number.

251260655 is a deficient number, since it is larger than the sum of its proper divisors (66121345).

251260655 is a wasteful number, since it uses less digits than its factorization.

251260655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644873.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 251260655 is about 15851.2035820628. The cubic root of 251260655 is about 631.0176339147.

The spelling of 251260655 in words is "two hundred fifty-one million, two hundred sixty thousand, six hundred fifty-five".