215161989 has 24 divisors (see below), whose sum is σ = 334284480. Its totient is φ = 122742144.

The previous prime is 215161943. The next prime is 215162027. The reversal of 215161989 is 989161512.

It is not a de Polignac number, because 215161989 - 2¹⁹ = 214637701 is a prime.

It is a super-2 number, since 2×215161989² = 92589363020872242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215161989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215161939) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 143757 + ... + 145245.

It is an arithmetic number, because the mean of its divisors is an integer number (13928520).

Almost surely, 2^215161989 is an apocalyptic number.

It is an amenable number.

215161989 is a deficient number, since it is larger than the sum of its proper divisors (119122491).

215161989 is a wasteful number, since it uses less digits than its factorization.

215161989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489 (or 2482 counting only the distinct ones).

The product of its digits is 38880, while the sum is 42.

The square root of 215161989 is about 14668.4010376046. The cubic root of 215161989 is about 599.2230582590.

The spelling of 215161989 in words is "two hundred fifteen million, one hundred sixty-one thousand, nine hundred eighty-nine".