117981427 has 2 divisors, whose sum is σ = 117981428. Its totient is φ = 117981426.

The previous prime is 117981403. The next prime is 117981449. The reversal of 117981427 is 724189711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117981427 - 2⁷ = 117981299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117981427.

It is not a weakly prime, because it can be changed into another prime (117981827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58990713 + 58990714.

It is an arithmetic number, because the mean of its divisors is an integer number (58990714).

Almost surely, 2^117981427 is an apocalyptic number.

117981427 is a deficient number, since it is larger than the sum of its proper divisors (1).

117981427 is an equidigital number, since it uses as much as digits as its factorization.

117981427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 117981427 is about 10861.9255659390. The cubic root of 117981427 is about 490.4610778711.

It can be divided in two parts, 11798 and 1427, that added together give a square (13225 = 115²).

The spelling of 117981427 in words is "one hundred seventeen million, nine hundred eighty-one thousand, four hundred twenty-seven".