117987961 has 8 divisors (see below), whose sum is σ = 145216064. Its totient is φ = 93353040.

The previous prime is 117987949. The next prime is 117987983. The reversal of 117987961 is 169789711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117987961 - 2⁷ = 117987833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117987941) 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 7 ways as a sum of consecutive naturals, for example, 648195 + ... + 648376.

It is an arithmetic number, because the mean of its divisors is an integer number (18152008).

Almost surely, 2^117987961 is an apocalyptic number.

It is an amenable number.

117987961 is a deficient number, since it is larger than the sum of its proper divisors (27228103).

117987961 is a wasteful number, since it uses less digits than its factorization.

117987961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296591.

The product of its digits is 190512, while the sum is 49.

The square root of 117987961 is about 10862.2263371742. The cubic root of 117987961 is about 490.4701318768.

The spelling of 117987961 in words is "one hundred seventeen million, nine hundred eighty-seven thousand, nine hundred sixty-one".