117257815 has 4 divisors (see below), whose sum is σ = 140709384. Its totient is φ = 93806248.

The previous prime is 117257807. The next prime is 117257837. The reversal of 117257815 is 518752711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518752711 = 53 ⋅9787787.

It is a cyclic number.

It is not a de Polignac number, because 117257815 - 2³ = 117257807 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, 11725777 + ... + 11725786.

It is an arithmetic number, because the mean of its divisors is an integer number (35177346).

Almost surely, 2^117257815 is an apocalyptic number.

117257815 is a deficient number, since it is larger than the sum of its proper divisors (23451569).

117257815 is an equidigital number, since it uses as much as digits as its factorization.

117257815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23451568.

The product of its digits is 19600, while the sum is 37.

The square root of 117257815 is about 10828.5647710119. The cubic root of 117257815 is about 489.4563107478.

The spelling of 117257815 in words is "one hundred seventeen million, two hundred fifty-seven thousand, eight hundred fifteen".