117781598969 has 4 divisors (see below), whose sum is σ = 117782456820. Its totient is φ = 117780741120.

The previous prime is 117781598941. The next prime is 117781598999. The reversal of 117781598969 is 969895187711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 969895187711 = 26647 ⋅36397913.

It can be written as a sum of positive squares in 2 ways, for example, as 88399182400 + 29382416569 = 297320^2 + 171413^2 .

It is a cyclic number.

It is not a de Polignac number, because 117781598969 - 2⁸ = 117781598713 is a prime.

It is a super-2 number, since 2×117781598969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117781598929) 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, 171464 + ... + 514745.

It is an arithmetic number, because the mean of its divisors is an integer number (29445614205).

Almost surely, 2^117781598969 is an apocalyptic number.

It is an amenable number.

117781598969 is a deficient number, since it is larger than the sum of its proper divisors (857851).

117781598969 is an equidigital number, since it uses as much as digits as its factorization.

117781598969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857850.

The product of its digits is 68584320, while the sum is 71.

The spelling of 117781598969 in words is "one hundred seventeen billion, seven hundred eighty-one million, five hundred ninety-eight thousand, nine hundred sixty-nine".