117892981 has 2 divisors, whose sum is σ = 117892982. Its totient is φ = 117892980.

The previous prime is 117892979. The next prime is 117892987. The reversal of 117892981 is 189298711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82192356 + 35700625 = 9066^2 + 5975^2 .

It is a cyclic number.

It is not a de Polignac number, because 117892981 - 2¹ = 117892979 is a prime.

It is a super-2 number, since 2×117892981² = 27797509938132722, which contains 22 as substring.

Together with 117892979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117892987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58946490 + 58946491.

It is an arithmetic number, because the mean of its divisors is an integer number (58946491).

Almost surely, 2^117892981 is an apocalyptic number.

It is an amenable number.

117892981 is a deficient number, since it is larger than the sum of its proper divisors (1).

117892981 is an equidigital number, since it uses as much as digits as its factorization.

117892981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 46.

The square root of 117892981 is about 10857.8534250560. The cubic root of 117892981 is about 490.3384874882.

The spelling of 117892981 in words is "one hundred seventeen million, eight hundred ninety-two thousand, nine hundred eighty-one".