1251515264 has 16 divisors (see below), whose sum is σ = 2493253320. Its totient is φ = 625757568.

The previous prime is 1251515249. The next prime is 1251515281. The reversal of 1251515264 is 4625151521.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1251515264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4888604 + ... + 4888859.

Almost surely, 2^1251515264 is an apocalyptic number.

It is an amenable number.

1251515264 is a deficient number, since it is larger than the sum of its proper divisors (1241738056).

1251515264 is an frugal number, since it uses more digits than its factorization.

1251515264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9777477 (or 9777465 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

The square root of 1251515264 is about 35376.7616381149. The cubic root of 1251515264 is about 1077.6524408974.

Adding to 1251515264 its reverse (4625151521), we get a palindrome (5876666785).

The spelling of 1251515264 in words is "one billion, two hundred fifty-one million, five hundred fifteen thousand, two hundred sixty-four".