117145517 has 2 divisors, whose sum is σ = 117145518. Its totient is φ = 117145516.

The previous prime is 117145513. The next prime is 117145519. The reversal of 117145517 is 715541711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90992521 + 26152996 = 9539^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 117145517 - 2² = 117145513 is a prime.

Together with 117145519, 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 (117145513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58572758 + 58572759.

It is an arithmetic number, because the mean of its divisors is an integer number (58572759).

Almost surely, 2^117145517 is an apocalyptic number.

It is an amenable number.

117145517 is a deficient number, since it is larger than the sum of its proper divisors (1).

117145517 is an equidigital number, since it uses as much as digits as its factorization.

117145517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4900, while the sum is 32.

The square root of 117145517 is about 10823.3782618922. The cubic root of 117145517 is about 489.3000098059.

It can be divided in two parts, 11 and 7145517, that multiplied together give a palindrome (78600687).

The spelling of 117145517 in words is "one hundred seventeen million, one hundred forty-five thousand, five hundred seventeen".