118137521 has 4 divisors (see below), whose sum is σ = 118257012. Its totient is φ = 118018032.

The previous prime is 118137517. The next prime is 118137553. The reversal of 118137521 is 125731811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54760000 + 63377521 = 7400^2 + 7961^2 .

It is a cyclic number.

It is not a de Polignac number, because 118137521 - 2² = 118137517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118137571) 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, 58250 + ... + 60243.

It is an arithmetic number, because the mean of its divisors is an integer number (29564253).

Almost surely, 2^118137521 is an apocalyptic number.

It is an amenable number.

118137521 is a deficient number, since it is larger than the sum of its proper divisors (119491).

118137521 is an equidigital number, since it uses as much as digits as its factorization.

118137521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119490.

The product of its digits is 1680, while the sum is 29.

The square root of 118137521 is about 10869.1085651032. The cubic root of 118137521 is about 490.6772822211.

The spelling of 118137521 in words is "one hundred eighteen million, one hundred thirty-seven thousand, five hundred twenty-one".