215551512 has 96 divisors (see below), whose sum is σ = 642170880. Its totient is φ = 64774080.

The previous prime is 215551489. The next prime is 215551543. The reversal of 215551512 is 215155512.

It is a super-2 number, since 2×215551512² = 92924908650972288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99513 + ... + 101655.

It is an arithmetic number, because the mean of its divisors is an integer number (6689280).

Almost surely, 2^215551512 is an apocalyptic number.

215551512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215551512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321085440).

215551512 is an abundant number, since it is smaller than the sum of its proper divisors (426619368).

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

215551512 is a wasteful number, since it uses less digits than its factorization.

215551512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293 (or 2286 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 215551512 is about 14681.6726567513. The cubic root of 215551512 is about 599.5844455907.

The spelling of 215551512 in words is "two hundred fifteen million, five hundred fifty-one thousand, five hundred twelve".