117497981 has 4 divisors (see below), whose sum is σ = 117899292. Its totient is φ = 117096672.

The previous prime is 117497909. The next prime is 117498011. The reversal of 117497981 is 189794711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106275481 + 11222500 = 10309^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 117497981 - 2¹⁴ = 117481597 is a prime.

It is a super-2 number, since 2×117497981² = 27611551078152722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117490981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200216 + ... + 200801.

It is an arithmetic number, because the mean of its divisors is an integer number (29474823).

Almost surely, 2^117497981 is an apocalyptic number.

It is an amenable number.

117497981 is a deficient number, since it is larger than the sum of its proper divisors (401311).

117497981 is an equidigital number, since it uses as much as digits as its factorization.

117497981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401310.

The product of its digits is 127008, while the sum is 47.

The square root of 117497981 is about 10839.6485644139. The cubic root of 117497981 is about 489.7902489738.

The spelling of 117497981 in words is "one hundred seventeen million, four hundred ninety-seven thousand, nine hundred eighty-one".