108121815 has 12 divisors (see below), whose sum is σ = 187411224. Its totient is φ = 57664944.

The previous prime is 108121801. The next prime is 108121843. The reversal of 108121815 is 518121801.

It is a de Polignac number, because none of the positive numbers 2^k-108121815 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1201309 + ... + 1201398.

It is an arithmetic number, because the mean of its divisors is an integer number (15617602).

Almost surely, 2^108121815 is an apocalyptic number.

108121815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

108121815 is a deficient number, since it is larger than the sum of its proper divisors (79289409).

108121815 is a wasteful number, since it uses less digits than its factorization.

108121815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402718 (or 2402715 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 108121815 is about 10398.1640206336. The cubic root of 108121815 is about 476.3992939268.

The spelling of 108121815 in words is "one hundred eight million, one hundred twenty-one thousand, eight hundred fifteen".