1251252642 has 16 divisors (see below), whose sum is σ = 2502908352. Its totient is φ = 417017040.

The previous prime is 1251252623. The next prime is 1251252689. The reversal of 1251252642 is 2462521521.

It is a super-2 number, since 2×1251252642² = 3131266348223960328, which contains 22 as substring.

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, 36643 + ... + 62009.

It is an arithmetic number, because the mean of its divisors is an integer number (156431772).

Almost surely, 2^1251252642 is an apocalyptic number.

1251252642 is an abundant number, since it is smaller than the sum of its proper divisors (1251655710).

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

1251252642 is a wasteful number, since it uses less digits than its factorization.

1251252642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33593.

The product of its digits is 9600, while the sum is 30.

The square root of 1251252642 is about 35373.0496564828. The cubic root of 1251252642 is about 1077.5770562694.

The spelling of 1251252642 in words is "one billion, two hundred fifty-one million, two hundred fifty-two thousand, six hundred forty-two".