1251688255 has 16 divisors (see below), whose sum is σ = 1537651584. Its totient is φ = 977702400.

The previous prime is 1251688241. The next prime is 1251688261. The reversal of 1251688255 is 5528861521.

It is not a de Polignac number, because 1251688255 - 2¹⁵ = 1251655487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95605 + ... + 107905.

It is an arithmetic number, because the mean of its divisors is an integer number (96103224).

Almost surely, 2^1251688255 is an apocalyptic number.

1251688255 is a deficient number, since it is larger than the sum of its proper divisors (285963329).

1251688255 is a wasteful number, since it uses less digits than its factorization.

1251688255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12786.

The product of its digits is 192000, while the sum is 43.

The square root of 1251688255 is about 35379.2065343473. The cubic root of 1251688255 is about 1077.7020915329.

The spelling of 1251688255 in words is "one billion, two hundred fifty-one million, six hundred eighty-eight thousand, two hundred fifty-five".