1251216615 has 32 divisors (see below), whose sum is σ = 2211609600. Its totient is φ = 598965120.

The previous prime is 1251216613. The next prime is 1251216697. The reversal of 1251216615 is 5166121521.

It is not a de Polignac number, because 1251216615 - 2¹ = 1251216613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251216613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34960 + ... + 61029.

It is an arithmetic number, because the mean of its divisors is an integer number (69112800).

Almost surely, 2^1251216615 is an apocalyptic number.

1251216615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251216615 is a deficient number, since it is larger than the sum of its proper divisors (960392985).

1251216615 is a wasteful number, since it uses less digits than its factorization.

1251216615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96087.

The product of its digits is 3600, while the sum is 30.

The square root of 1251216615 is about 35372.5404091931. The cubic root of 1251216615 is about 1077.5667140358.

The spelling of 1251216615 in words is "one billion, two hundred fifty-one million, two hundred sixteen thousand, six hundred fifteen".