117168781 has 2 divisors, whose sum is σ = 117168782. Its totient is φ = 117168780.

The previous prime is 117168769. The next prime is 117168797. The reversal of 117168781 is 187861711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102191881 + 14976900 = 10109^2 + 3870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117168781 is a prime.

It is a super-2 number, since 2×117168781² = 27457046482051922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117168731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58584390 + 58584391.

It is an arithmetic number, because the mean of its divisors is an integer number (58584391).

Almost surely, 2^117168781 is an apocalyptic number.

It is an amenable number.

117168781 is a deficient number, since it is larger than the sum of its proper divisors (1).

117168781 is an equidigital number, since it uses as much as digits as its factorization.

117168781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 40.

The square root of 117168781 is about 10824.4529192010. The cubic root of 117168781 is about 489.3323977916.

The spelling of 117168781 in words is "one hundred seventeen million, one hundred sixty-eight thousand, seven hundred eighty-one".