118515636121 has 9 divisors (see below), whose sum is σ = 125088503061. Its totient is φ = 112271774364.

The previous prime is 118515636103. The next prime is 118515636133. The reversal of 118515636121 is 121636515811.

The square root of 118515636121 is 344261.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 118515636121 - 2²³ = 118507247513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118515636191) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6531900 + ... + 6550018.

Almost surely, 2^118515636121 is an apocalyptic number.

118515636121 is the 344261-st square number.

118515636121 is the 172131-st centered octagonal number.

It is an amenable number.

118515636121 is a deficient number, since it is larger than the sum of its proper divisors (6572866940).

118515636121 is an frugal number, since it uses more digits than its factorization.

118515636121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36276 (or 18138 counting only the distinct ones).

The product of its digits is 43200, while the sum is 40.

The spelling of 118515636121 in words is "one hundred eighteen billion, five hundred fifteen million, six hundred thirty-six thousand, one hundred twenty-one".