118115521 has 4 divisors (see below), whose sum is σ = 122188500. Its totient is φ = 114042544.

The previous prime is 118115497. The next prime is 118115527. The reversal of 118115521 is 125511811.

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 100801600 + 17313921 = 10040^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 118115521 - 2⁵ = 118115489 is a prime.

It is a super-2 number, since 2×118115521² = 27902552602202882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118115527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036446 + ... + 2036503.

It is an arithmetic number, because the mean of its divisors is an integer number (30547125).

Almost surely, 2^118115521 is an apocalyptic number.

It is an amenable number.

118115521 is a deficient number, since it is larger than the sum of its proper divisors (4072979).

118115521 is an equidigital number, since it uses as much as digits as its factorization.

118115521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072978.

The product of its digits is 400, while the sum is 25.

The square root of 118115521 is about 10868.0964754643. The cubic root of 118115521 is about 490.6468217592.

The spelling of 118115521 in words is "one hundred eighteen million, one hundred fifteen thousand, five hundred twenty-one".