251201856 has 28 divisors (see below), whose sum is σ = 664638752. Its totient is φ = 83733888.

The previous prime is 251201849. The next prime is 251201861. The reversal of 251201856 is 658102152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653980 + ... + 654363.

Almost surely, 2^251201856 is an apocalyptic number.

It is an amenable number.

251201856 is an abundant number, since it is smaller than the sum of its proper divisors (413436896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251201856 is a wasteful number, since it uses less digits than its factorization.

251201856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308358 (or 1308348 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 251201856 is about 15849.3487563370. The cubic root of 251201856 is about 630.9684073450.

The spelling of 251201856 in words is "two hundred fifty-one million, two hundred one thousand, eight hundred fifty-six".