2151215694 has 12 divisors (see below), whose sum is σ = 4660967376. Its totient is φ = 717071892.

The previous prime is 2151215687. The next prime is 2151215711. The reversal of 2151215694 is 4965121512.

2151215694 is a `hidden beast` number, since 2 + 1 + 512 + 1 + 56 + 94 = 666.

It is a super-2 number, since 2×2151215694² = 9255457924223803272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 59755974 + ... + 59756009.

It is an arithmetic number, because the mean of its divisors is an integer number (388413948).

Almost surely, 2^2151215694 is an apocalyptic number.

2151215694 is an abundant number, since it is smaller than the sum of its proper divisors (2509751682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151215694 is a wasteful number, since it uses less digits than its factorization.

2151215694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119511991 (or 119511988 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2151215694 is about 46381.1997904323. The cubic root of 2151215694 is about 1290.9060985777.

The spelling of 2151215694 in words is "two billion, one hundred fifty-one million, two hundred fifteen thousand, six hundred ninety-four".