117901989 has 6 divisors (see below), whose sum is σ = 170302886. Its totient is φ = 78601320.

The previous prime is 117901981. The next prime is 117901997. The reversal of 117901989 is 989109711.

It is an interprime number because it is at equal distance from previous prime (117901981) and next prime (117901997).

It can be written as a sum of positive squares in only one way, i.e., 117288900 + 613089 = 10830^2 + 783^2 .

It is not a de Polignac number, because 117901989 - 2³ = 117901981 is a prime.

It is a super-2 number, since 2×117901989² = 27801758020312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117901981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6550102 + ... + 6550119.

Almost surely, 2^117901989 is an apocalyptic number.

It is an amenable number.

117901989 is a deficient number, since it is larger than the sum of its proper divisors (52400897).

117901989 is a wasteful number, since it uses less digits than its factorization.

117901989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13100227 (or 13100224 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 117901989 is about 10858.2682320893. The cubic root of 117901989 is about 490.3509758104.

The spelling of 117901989 in words is "one hundred seventeen million, nine hundred one thousand, nine hundred eighty-nine".