117845815 has 4 divisors (see below), whose sum is σ = 141414984. Its totient is φ = 94276648.

The previous prime is 117845803. The next prime is 117845863. The reversal of 117845815 is 518548711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 117845815 - 2¹¹ = 117843767 is a prime.

It is a super-2 number, since 2×117845815² = 27775272226028450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 11784577 + ... + 11784586.

It is an arithmetic number, because the mean of its divisors is an integer number (35353746).

Almost surely, 2^117845815 is an apocalyptic number.

117845815 is a deficient number, since it is larger than the sum of its proper divisors (23569169).

117845815 is an equidigital number, since it uses as much as digits as its factorization.

117845815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23569168.

The product of its digits is 44800, while the sum is 40.

The square root of 117845815 is about 10855.6812315027. The cubic root of 117845815 is about 490.2730880901.

The spelling of 117845815 in words is "one hundred seventeen million, eight hundred forty-five thousand, eight hundred fifteen".