117415981 has 2 divisors, whose sum is σ = 117415982. Its totient is φ = 117415980.

The previous prime is 117415973. The next prime is 117415997. The reversal of 117415981 is 189514711.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95942025 + 21473956 = 9795^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 117415981 - 2³ = 117415973 is a prime.

It is a super-2 number, since 2×117415981² = 27573025188384722, 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 117415981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117413981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58707990 + 58707991.

It is an arithmetic number, because the mean of its divisors is an integer number (58707991).

Almost surely, 2^117415981 is an apocalyptic number.

It is an amenable number.

117415981 is a deficient number, since it is larger than the sum of its proper divisors (1).

117415981 is an equidigital number, since it uses as much as digits as its factorization.

117415981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 37.

The square root of 117415981 is about 10835.8654938127. The cubic root of 117415981 is about 489.6762834779.

The spelling of 117415981 in words is "one hundred seventeen million, four hundred fifteen thousand, nine hundred eighty-one".