1251252644 has 6 divisors (see below), whose sum is σ = 2189692134. Its totient is φ = 625626320.

The previous prime is 1251252623. The next prime is 1251252689. The reversal of 1251252644 is 4462521521.

It can be written as a sum of positive squares in only one way, i.e., 762312100 + 488940544 = 27610^2 + 22112^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1251252644.

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 as a sum of consecutive naturals, namely, 156406577 + ... + 156406584.

It is an arithmetic number, because the mean of its divisors is an integer number (364948689).

Almost surely, 2^1251252644 is an apocalyptic number.

It is an amenable number.

1251252644 is a deficient number, since it is larger than the sum of its proper divisors (938439490).

1251252644 is a wasteful number, since it uses less digits than its factorization.

1251252644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312813165 (or 312813163 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 1251252644 is about 35373.0496847529. The cubic root of 1251252644 is about 1077.5770568435.

It can be divided in two parts, 12512 and 52644, that added together give a palindrome (65156).

The spelling of 1251252644 in words is "one billion, two hundred fifty-one million, two hundred fifty-two thousand, six hundred forty-four".