117499981 has 2 divisors, whose sum is σ = 117499982. Its totient is φ = 117499980.

The previous prime is 117499979. The next prime is 117500011. The reversal of 117499981 is 189994711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 18198756 = 9965^2 + 4266^2 .

It is an emirp because it is prime and its reverse (189994711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117499981 - 2¹ = 117499979 is a prime.

It is a super-2 number, since 2×117499981² = 27612491070000722, which contains 22 as substring.

Together with 117499979, 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 (117499381) 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, 58749990 + 58749991.

It is an arithmetic number, because the mean of its divisors is an integer number (58749991).

Almost surely, 2^117499981 is an apocalyptic number.

It is an amenable number.

117499981 is a deficient number, since it is larger than the sum of its proper divisors (1).

117499981 is an equidigital number, since it uses as much as digits as its factorization.

117499981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 49.

The square root of 117499981 is about 10839.7408179347. The cubic root of 117499981 is about 489.7930279576.

The spelling of 117499981 in words is "one hundred seventeen million, four hundred ninety-nine thousand, nine hundred eighty-one".