117177561 has 6 divisors (see below), whose sum is σ = 169256490. Its totient is φ = 78118368.

The previous prime is 117177559. The next prime is 117177563. The reversal of 117177561 is 165771711.

It is an interprime number because it is at equal distance from previous prime (117177559) and next prime (117177563).

It can be written as a sum of positive squares in only one way, i.e., 98307225 + 18870336 = 9915^2 + 4344^2 .

It is not a de Polignac number, because 117177561 - 2¹ = 117177559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117177563) 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, 6509856 + ... + 6509873.

It is an arithmetic number, because the mean of its divisors is an integer number (28209415).

Almost surely, 2^117177561 is an apocalyptic number.

It is an amenable number.

117177561 is a deficient number, since it is larger than the sum of its proper divisors (52078929).

117177561 is a wasteful number, since it uses less digits than its factorization.

117177561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019735 (or 13019732 counting only the distinct ones).

The product of its digits is 10290, while the sum is 36.

The square root of 117177561 is about 10824.8584748254. The cubic root of 117177561 is about 489.3446201347.

The spelling of 117177561 in words is "one hundred seventeen million, one hundred seventy-seven thousand, five hundred sixty-one".