117981261 has 12 divisors (see below), whose sum is σ = 171504892. Its totient is φ = 78152256.

The previous prime is 117981239. The next prime is 117981277. The reversal of 117981261 is 162189711.

It can be written as a sum of positive squares in 2 ways, for example, as 40717161 + 77264100 = 6381^2 + 8790^2 .

It is not a de Polignac number, because 117981261 - 2¹⁹ = 117456973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117981211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40336 + ... + 43161.

Almost surely, 2^117981261 is an apocalyptic number.

It is an amenable number.

117981261 is a deficient number, since it is larger than the sum of its proper divisors (53523631).

117981261 is a wasteful number, since it uses less digits than its factorization.

117981261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83660 (or 83657 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 117981261 is about 10861.9179245656. The cubic root of 117981261 is about 490.4608478446.

The spelling of 117981261 in words is "one hundred seventeen million, nine hundred eighty-one thousand, two hundred sixty-one".