117897513 has 4 divisors (see below), whose sum is σ = 157196688. Its totient is φ = 78598340.

The previous prime is 117897473. The next prime is 117897539. The reversal of 117897513 is 315798711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117897513 - 2⁶ = 117897449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117897553) 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, 19649583 + ... + 19649588.

It is an arithmetic number, because the mean of its divisors is an integer number (39299172).

Almost surely, 2^117897513 is an apocalyptic number.

It is an amenable number.

117897513 is a deficient number, since it is larger than the sum of its proper divisors (39299175).

117897513 is an equidigital number, since it uses as much as digits as its factorization.

117897513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39299174.

The product of its digits is 52920, while the sum is 42.

The square root of 117897513 is about 10858.0621199181. The cubic root of 117897513 is about 490.3447705469.

The spelling of 117897513 in words is "one hundred seventeen million, eight hundred ninety-seven thousand, five hundred thirteen".