117589781 has 2 divisors, whose sum is σ = 117589782. Its totient is φ = 117589780.

The previous prime is 117589739. The next prime is 117589783. The reversal of 117589781 is 187985711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117527281 + 62500 = 10841^2 + 250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117589781 is a prime.

It is a super-2 number, since 2×117589781² = 27654713191255922, which contains 22 as substring.

Together with 117589783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117589783) 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, 58794890 + 58794891.

It is an arithmetic number, because the mean of its divisors is an integer number (58794891).

Almost surely, 2^117589781 is an apocalyptic number.

It is an amenable number.

117589781 is a deficient number, since it is larger than the sum of its proper divisors (1).

117589781 is an equidigital number, since it uses as much as digits as its factorization.

117589781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 47.

The square root of 117589781 is about 10843.8821922778. The cubic root of 117589781 is about 489.9177718467.

The spelling of 117589781 in words is "one hundred seventeen million, five hundred eighty-nine thousand, seven hundred eighty-one".