117205615 has 4 divisors (see below), whose sum is σ = 140646744. Its totient is φ = 93764488.

The previous prime is 117205609. The next prime is 117205651. The reversal of 117205615 is 516502711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516502711 = 79 ⋅6538009.

It is a cyclic number.

It is not a de Polignac number, because 117205615 - 2³ = 117205607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11720557 + ... + 11720566.

It is an arithmetic number, because the mean of its divisors is an integer number (35161686).

Almost surely, 2^117205615 is an apocalyptic number.

117205615 is a deficient number, since it is larger than the sum of its proper divisors (23441129).

117205615 is an equidigital number, since it uses as much as digits as its factorization.

117205615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23441128.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 117205615 is about 10826.1542109837. The cubic root of 117205615 is about 489.3836690744.

The spelling of 117205615 in words is "one hundred seventeen million, two hundred five thousand, six hundred fifteen".