117811481 has 2 divisors, whose sum is σ = 117811482. Its totient is φ = 117811480.

The previous prime is 117811471. The next prime is 117811489. The reversal of 117811481 is 184118711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97199881 + 20611600 = 9859^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 117811481 - 2⁶ = 117811417 is a prime.

It is a super-2 number, since 2×117811481² = 27759090110826722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (117811489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58905740 + 58905741.

It is an arithmetic number, because the mean of its divisors is an integer number (58905741).

Almost surely, 2^117811481 is an apocalyptic number.

It is an amenable number.

117811481 is a deficient number, since it is larger than the sum of its proper divisors (1).

117811481 is an equidigital number, since it uses as much as digits as its factorization.

117811481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 32.

The square root of 117811481 is about 10854.0997323592. The cubic root of 117811481 is about 490.2254703018.

The spelling of 117811481 in words is "one hundred seventeen million, eight hundred eleven thousand, four hundred eighty-one".