1251312442 has 16 divisors (see below), whose sum is σ = 1904371200. Its totient is φ = 616552560.

The previous prime is 1251312437. The next prime is 1251312467. The reversal of 1251312442 is 2442131521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78159 + ... + 92797.

It is an arithmetic number, because the mean of its divisors is an integer number (119023200).

Almost surely, 2^1251312442 is an apocalyptic number.

1251312442 is a deficient number, since it is larger than the sum of its proper divisors (653058758).

1251312442 is a wasteful number, since it uses less digits than its factorization.

1251312442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15261.

The product of its digits is 1920, while the sum is 25.

The square root of 1251312442 is about 35373.8949226686. The cubic root of 1251312442 is about 1077.5942225552.

Adding to 1251312442 its reverse (2442131521), we get a palindrome (3693443963).

The spelling of 1251312442 in words is "one billion, two hundred fifty-one million, three hundred twelve thousand, four hundred forty-two".