1251231652 has 24 divisors (see below), whose sum is σ = 2389665600. Its totient is φ = 568515360.

The previous prime is 1251231647. The next prime is 1251231679. The reversal of 1251231652 is 2561321521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251231652.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161974 + ... + 169522.

It is an arithmetic number, because the mean of its divisors is an integer number (99569400).

Almost surely, 2^1251231652 is an apocalyptic number.

It is an amenable number.

1251231652 is a deficient number, since it is larger than the sum of its proper divisors (1138433948).

1251231652 is a wasteful number, since it uses less digits than its factorization.

1251231652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11331 (or 11329 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 1251231652 is about 35372.7529604355. The cubic root of 1251231652 is about 1077.5710307160.

It can be divided in two parts, 1251 and 231652, that added together give a triangular number (232903 = T₆₈₂).

The spelling of 1251231652 in words is "one billion, two hundred fifty-one million, two hundred thirty-one thousand, six hundred fifty-two".