1251865652 has 12 divisors (see below), whose sum is σ = 2319633540. Its totient is φ = 589113216.

The previous prime is 1251865639. The next prime is 1251865661. The reversal of 1251865652 is 2565681521.

It can be written as a sum of positive squares in 2 ways, for example, as 1104631696 + 147233956 = 33236^2 + 12134^2 .

It is a super-2 number, since 2×1251865652² = 3134335221314770208, which contains 22 as substring.

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, 9204827 + ... + 9204962.

It is an arithmetic number, because the mean of its divisors is an integer number (193302795).

Almost surely, 2^1251865652 is an apocalyptic number.

It is an amenable number.

1251865652 is a deficient number, since it is larger than the sum of its proper divisors (1067767888).

1251865652 is a wasteful number, since it uses less digits than its factorization.

1251865652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18409810 (or 18409808 counting only the distinct ones).

The product of its digits is 144000, while the sum is 41.

The square root of 1251865652 is about 35381.7135254922. The cubic root of 1251865652 is about 1077.7530019962.

The spelling of 1251865652 in words is "one billion, two hundred fifty-one million, eight hundred sixty-five thousand, six hundred fifty-two".