117121618 has 4 divisors (see below), whose sum is σ = 175682430. Its totient is φ = 58560808.

The previous prime is 117121601. The next prime is 117121657. The reversal of 117121618 is 816121711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 816121711 = 7043 ⋅115877.

It can be written as a sum of positive squares in only one way, i.e., 72539289 + 44582329 = 8517^2 + 6677^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29280403 + ... + 29280406.

Almost surely, 2^117121618 is an apocalyptic number.

117121618 is a deficient number, since it is larger than the sum of its proper divisors (58560812).

117121618 is an equidigital number, since it uses as much as digits as its factorization.

117121618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58560811.

The product of its digits is 672, while the sum is 28.

The square root of 117121618 is about 10822.2741602678. The cubic root of 117121618 is about 489.2667333120.

The spelling of 117121618 in words is "one hundred seventeen million, one hundred twenty-one thousand, six hundred eighteen".