118913521 has 4 divisors (see below), whose sum is σ = 125908452. Its totient is φ = 111918592.

The previous prime is 118913479. The next prime is 118913537. The reversal of 118913521 is 125319811.

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 37210000 + 81703521 = 6100^2 + 9039^2 .

It is a cyclic number.

It is not a de Polignac number, because 118913521 - 2⁹ = 118913009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118913621) 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, 3497440 + ... + 3497473.

It is an arithmetic number, because the mean of its divisors is an integer number (31477113).

Almost surely, 2^118913521 is an apocalyptic number.

It is an amenable number.

118913521 is a deficient number, since it is larger than the sum of its proper divisors (6994931).

118913521 is an equidigital number, since it uses as much as digits as its factorization.

118913521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994930.

The product of its digits is 2160, while the sum is 31.

The square root of 118913521 is about 10904.7476357777. The cubic root of 118913521 is about 491.7492952896.

The spelling of 118913521 in words is "one hundred eighteen million, nine hundred thirteen thousand, five hundred twenty-one".