118520621 has 4 divisors (see below), whose sum is σ = 120463644. Its totient is φ = 116577600.

The previous prime is 118520603. The next prime is 118520669. The reversal of 118520621 is 126025811.

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 4351396 + 114169225 = 2086^2 + 10685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118520621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118520671) 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, 971420 + ... + 971541.

It is an arithmetic number, because the mean of its divisors is an integer number (30115911).

Almost surely, 2^118520621 is an apocalyptic number.

It is an amenable number.

118520621 is a deficient number, since it is larger than the sum of its proper divisors (1943023).

118520621 is an equidigital number, since it uses as much as digits as its factorization.

118520621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943022.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 118520621 is about 10886.7176412360. The cubic root of 118520621 is about 491.2071044045.

The spelling of 118520621 in words is "one hundred eighteen million, five hundred twenty thousand, six hundred twenty-one".