1251974564 has 6 divisors (see below), whose sum is σ = 2190955494. Its totient is φ = 625987280.

The previous prime is 1251974447. The next prime is 1251974569. The reversal of 1251974564 is 4654791521.

It can be written as a sum of positive squares in only one way, i.e., 1222900900 + 29073664 = 34970^2 + 5392^2 .

It is not an unprimeable number, because it can be changed into a prime (1251974569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156496817 + ... + 156496824.

It is an arithmetic number, because the mean of its divisors is an integer number (365159249).

Almost surely, 2^1251974564 is an apocalyptic number.

It is an amenable number.

1251974564 is a deficient number, since it is larger than the sum of its proper divisors (938980930).

1251974564 is a wasteful number, since it uses less digits than its factorization.

1251974564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312993645 (or 312993643 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The square root of 1251974564 is about 35383.2525921516. The cubic root of 1251974564 is about 1077.7842558374.

The spelling of 1251974564 in words is "one billion, two hundred fifty-one million, nine hundred seventy-four thousand, five hundred sixty-four".