118591021 has 8 divisors (see below), whose sum is σ = 119715200. Its totient is φ = 117471600.

The previous prime is 118591009. The next prime is 118591079. The reversal of 118591021 is 120195811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 118591021 - 2⁹ = 118590509 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 (118591001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65395 + ... + 67183.

It is an arithmetic number, because the mean of its divisors is an integer number (14964400).

Almost surely, 2^118591021 is an apocalyptic number.

It is an amenable number.

118591021 is a deficient number, since it is larger than the sum of its proper divisors (1124179).

118591021 is a wasteful number, since it uses less digits than its factorization.

118591021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 118591021 is about 10889.9504590241. The cubic root of 118591021 is about 491.3043424357.

It can be divided in two parts, 11859 and 1021, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 118591021 in words is "one hundred eighteen million, five hundred ninety-one thousand, twenty-one".