215054091 has 18 divisors (see below), whose sum is σ = 361350132. Its totient is φ = 122887800.

The previous prime is 215054087. The next prime is 215054153. The reversal of 215054091 is 190450512.

It is not a de Polignac number, because 215054091 - 2² = 215054087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215054041) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 243385 + ... + 244266.

Almost surely, 2^215054091 is an apocalyptic number.

215054091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

215054091 is a deficient number, since it is larger than the sum of its proper divisors (146296041).

215054091 is a wasteful number, since it uses less digits than its factorization.

215054091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487671 (or 487661 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 215054091 is about 14664.7226704087. The cubic root of 215054091 is about 599.1228767161.

The spelling of 215054091 in words is "two hundred fifteen million, fifty-four thousand, ninety-one".