117661231 has 2 divisors, whose sum is σ = 117661232. Its totient is φ = 117661230.

The previous prime is 117661211. The next prime is 117661241. The reversal of 117661231 is 132166711.

It is a strong prime.

It is an emirp because it is prime and its reverse (132166711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117661231 - 2¹¹ = 117659183 is a prime.

It is a super-2 number, since 2×117661231² = 27688330560870722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 117661231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117661211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58830615 + 58830616.

It is an arithmetic number, because the mean of its divisors is an integer number (58830616).

Almost surely, 2^117661231 is an apocalyptic number.

117661231 is a deficient number, since it is larger than the sum of its proper divisors (1).

117661231 is an equidigital number, since it uses as much as digits as its factorization.

117661231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 117661231 is about 10847.1761763143. The cubic root of 117661231 is about 490.0169798364.

The spelling of 117661231 in words is "one hundred seventeen million, six hundred sixty-one thousand, two hundred thirty-one".