118194721 has 2 divisors, whose sum is σ = 118194722. Its totient is φ = 118194720.

The previous prime is 118194719. The next prime is 118194743. The reversal of 118194721 is 127491811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 56415121 = 7860^2 + 7511^2 .

It is a cyclic number.

It is not a de Polignac number, because 118194721 - 2¹ = 118194719 is a prime.

Together with 118194719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (118194701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59097360 + 59097361.

It is an arithmetic number, because the mean of its divisors is an integer number (59097361).

Almost surely, 2^118194721 is an apocalyptic number.

It is an amenable number.

118194721 is a deficient number, since it is larger than the sum of its proper divisors (1).

118194721 is an equidigital number, since it uses as much as digits as its factorization.

118194721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 34.

The square root of 118194721 is about 10871.7395572190. The cubic root of 118194721 is about 490.7564617279.

The spelling of 118194721 in words is "one hundred eighteen million, one hundred ninety-four thousand, seven hundred twenty-one".