215561512 has 32 divisors (see below), whose sum is σ = 413956800. Its totient is φ = 105202944.

The previous prime is 215561483. The next prime is 215561557. The reversal of 215561512 is 215165512.

215561512 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215561512² = 92933530911452288, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 58789 + ... + 62347.

It is an arithmetic number, because the mean of its divisors is an integer number (12936150).

Almost surely, 2^215561512 is an apocalyptic number.

It is an amenable number.

215561512 is a deficient number, since it is larger than the sum of its proper divisors (198395288).

215561512 is a wasteful number, since it uses less digits than its factorization.

215561512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745 (or 3741 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The square root of 215561512 is about 14682.0132134527. The cubic root of 215561512 is about 599.5937175456.

The spelling of 215561512 in words is "two hundred fifteen million, five hundred sixty-one thousand, five hundred twelve".