215161990 has 16 divisors (see below), whose sum is σ = 388407600. Its totient is φ = 85816800.

The previous prime is 215161943. The next prime is 215162027. The reversal of 215161990 is 99161512.

It is a happy number.

It is a congruent number.

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, 27336 + ... + 34315.

It is an arithmetic number, because the mean of its divisors is an integer number (24275475).

Almost surely, 2^215161990 is an apocalyptic number.

215161990 is a deficient number, since it is larger than the sum of its proper divisors (173245610).

215161990 is a wasteful number, since it uses less digits than its factorization.

215161990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62007.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 215161990 is about 14668.4010716915. The cubic root of 215161990 is about 599.2230591874.

The spelling of 215161990 in words is "two hundred fifteen million, one hundred sixty-one thousand, nine hundred ninety".