118564139 has 4 divisors (see below), whose sum is σ = 118587024. Its totient is φ = 118541256.

The previous prime is 118564079. The next prime is 118564141. The reversal of 118564139 is 931465811.

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 118564139 - 2¹⁶ = 118498603 is a prime.

It is a super-2 number, since 2×118564139² = 28114910113622642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118564189) 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, 449 + ... + 15405.

It is an arithmetic number, because the mean of its divisors is an integer number (29646756).

Almost surely, 2^118564139 is an apocalyptic number.

118564139 is a deficient number, since it is larger than the sum of its proper divisors (22885).

118564139 is an equidigital number, since it uses as much as digits as its factorization.

118564139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22884.

The product of its digits is 25920, while the sum is 38.

The square root of 118564139 is about 10888.7161318495. The cubic root of 118564139 is about 491.2672169679.

The spelling of 118564139 in words is "one hundred eighteen million, five hundred sixty-four thousand, one hundred thirty-nine".