118519721 has 2 divisors, whose sum is σ = 118519722. Its totient is φ = 118519720.

The previous prime is 118519697. The next prime is 118519747. The reversal of 118519721 is 127915811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115261696 + 3258025 = 10736^2 + 1805^2 .

It is a cyclic number.

It is not a de Polignac number, because 118519721 - 2²² = 114325417 is a prime.

It is not a weakly prime, because it can be changed into another prime (118519021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59259860 + 59259861.

It is an arithmetic number, because the mean of its divisors is an integer number (59259861).

Almost surely, 2^118519721 is an apocalyptic number.

It is an amenable number.

118519721 is a deficient number, since it is larger than the sum of its proper divisors (1).

118519721 is an equidigital number, since it uses as much as digits as its factorization.

118519721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 35.

The square root of 118519721 is about 10886.6763063848. The cubic root of 118519721 is about 491.2058610555.

The spelling of 118519721 in words is "one hundred eighteen million, five hundred nineteen thousand, seven hundred twenty-one".