1251148871 has 16 divisors (see below), whose sum is σ = 1540190208. Its totient is φ = 992692800.

The previous prime is 1251148861. The next prime is 1251148897. The reversal of 1251148871 is 1788411521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1251148871 - 2²⁶ = 1184040007 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251148861) 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, 120350 + ... + 130331.

It is an arithmetic number, because the mean of its divisors is an integer number (96261888).

Almost surely, 2^1251148871 is an apocalyptic number.

1251148871 is a deficient number, since it is larger than the sum of its proper divisors (289041337).

1251148871 is a wasteful number, since it uses less digits than its factorization.

1251148871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250742.

The product of its digits is 17920, while the sum is 38.

The square root of 1251148871 is about 35371.5828172843. The cubic root of 1251148871 is about 1077.5472662983.

The spelling of 1251148871 in words is "one billion, two hundred fifty-one million, one hundred forty-eight thousand, eight hundred seventy-one".