215129989 has 16 divisors (see below), whose sum is σ = 235699200. Its totient is φ = 195649776.

The previous prime is 215129983. The next prime is 215130011. The reversal of 215129989 is 989921512.

It is a cyclic number.

It is not a de Polignac number, because 215129989 - 2⁷ = 215129861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215129983) 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, 45972 + ... + 50434.

It is an arithmetic number, because the mean of its divisors is an integer number (14731200).

Almost surely, 2^215129989 is an apocalyptic number.

It is an amenable number.

215129989 is a deficient number, since it is larger than the sum of its proper divisors (20569211).

215129989 is a wasteful number, since it uses less digits than its factorization.

215129989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584.

The product of its digits is 116640, while the sum is 46.

The square root of 215129989 is about 14667.3102169416. The cubic root of 215129989 is about 599.1933502723.

The spelling of 215129989 in words is "two hundred fifteen million, one hundred twenty-nine thousand, nine hundred eighty-nine".