215412891 has 16 divisors (see below), whose sum is σ = 294057984. Its totient is φ = 140203584.

The previous prime is 215412881. The next prime is 215412913. The reversal of 215412891 is 198214512.

It is not a de Polignac number, because 215412891 - 2¹⁴ = 215396507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215412881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62766 + ... + 66108.

It is an arithmetic number, because the mean of its divisors is an integer number (18378624).

Almost surely, 2^215412891 is an apocalyptic number.

215412891 is a deficient number, since it is larger than the sum of its proper divisors (78645093).

215412891 is a wasteful number, since it uses less digits than its factorization.

215412891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850.

The product of its digits is 5760, while the sum is 33.

The square root of 215412891 is about 14676.9510117054. The cubic root of 215412891 is about 599.4558872736.

The spelling of 215412891 in words is "two hundred fifteen million, four hundred twelve thousand, eight hundred ninety-one".