215515641 has 12 divisors (see below), whose sum is σ = 315852656. Its totient is φ = 130615320.

The previous prime is 215515631. The next prime is 215515661. The reversal of 215515641 is 146515512.

215515641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215515641 - 2¹⁴ = 215499257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215515599 and 215515608.

It is not an unprimeable number, because it can be changed into a prime (215515631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296491 + ... + 297216.

Almost surely, 2^215515641 is an apocalyptic number.

It is an amenable number.

215515641 is a deficient number, since it is larger than the sum of its proper divisors (100337015).

215515641 is a wasteful number, since it uses less digits than its factorization.

215515641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593732 (or 593721 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 215515641 is about 14680.4509808112. The cubic root of 215515641 is about 599.5511838015.

The spelling of 215515641 in words is "two hundred fifteen million, five hundred fifteen thousand, six hundred forty-one".