117981631 has 2 divisors, whose sum is σ = 117981632. Its totient is φ = 117981630.

The previous prime is 117981607. The next prime is 117981673. The reversal of 117981631 is 136189711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 117981631 - 2¹³ = 117973439 is a prime.

It is a super-2 number, since 2×117981631² = 27839330506840322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117981131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58990815 + 58990816.

It is an arithmetic number, because the mean of its divisors is an integer number (58990816).

Almost surely, 2^117981631 is an apocalyptic number.

117981631 is a deficient number, since it is larger than the sum of its proper divisors (1).

117981631 is an equidigital number, since it uses as much as digits as its factorization.

117981631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 117981631 is about 10861.9349565351. The cubic root of 117981631 is about 490.4613605540.

The spelling of 117981631 in words is "one hundred seventeen million, nine hundred eighty-one thousand, six hundred thirty-one".