1251642442 has 32 divisors (see below), whose sum is σ = 2103580800. Its totient is φ = 555061248.

The previous prime is 1251642433. The next prime is 1251642443. The reversal of 1251642442 is 2442461521.

It is not an unprimeable number, because it can be changed into a prime (1251642443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 119659 + ... + 129697.

It is an arithmetic number, because the mean of its divisors is an integer number (65736900).

Almost surely, 2^1251642442 is an apocalyptic number.

1251642442 is a deficient number, since it is larger than the sum of its proper divisors (851938358).

1251642442 is a wasteful number, since it uses less digits than its factorization.

1251642442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270.

The product of its digits is 15360, while the sum is 31.

The square root of 1251642442 is about 35378.5590718446. The cubic root of 1251642442 is about 1077.6889430597.

The spelling of 1251642442 in words is "one billion, two hundred fifty-one million, six hundred forty-two thousand, four hundred forty-two".