117561765 has 32 divisors (see below), whose sum is σ = 199443456. Its totient is φ = 59028480.

The previous prime is 117561739. The next prime is 117561779. The reversal of 117561765 is 567165711.

It is not a de Polignac number, because 117561765 - 2⁹ = 117561253 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 13789 + ... + 20621.

It is an arithmetic number, because the mean of its divisors is an integer number (6232608).

Almost surely, 2^117561765 is an apocalyptic number.

117561765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117561765 is a deficient number, since it is larger than the sum of its proper divisors (81881691).

117561765 is a wasteful number, since it uses less digits than its factorization.

117561765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909.

The product of its digits is 44100, while the sum is 39.

The square root of 117561765 is about 10842.5903270390. The cubic root of 117561765 is about 489.8788607941.

The spelling of 117561765 in words is "one hundred seventeen million, five hundred sixty-one thousand, seven hundred sixty-five".