118887817 has 4 divisors (see below), whose sum is σ = 125881236. Its totient is φ = 111894400.

The previous prime is 118887809. The next prime is 118887827. The reversal of 118887817 is 718788811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718788811 = 13 ⋅55291447.

It can be written as a sum of positive squares in 2 ways, for example, as 106419856 + 12467961 = 10316^2 + 3531^2 .

It is a cyclic number.

It is not a de Polignac number, because 118887817 - 2³ = 118887809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118887827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3496684 + ... + 3496717.

It is an arithmetic number, because the mean of its divisors is an integer number (31470309).

Almost surely, 2^118887817 is an apocalyptic number.

118887817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

118887817 is a deficient number, since it is larger than the sum of its proper divisors (6993419).

118887817 is an equidigital number, since it uses as much as digits as its factorization.

118887817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6993418.

The product of its digits is 200704, while the sum is 49.

The square root of 118887817 is about 10903.5690028541. The cubic root of 118887817 is about 491.7138610384.

The spelling of 118887817 in words is "one hundred eighteen million, eight hundred eighty-seven thousand, eight hundred seventeen".