118721901 has 4 divisors (see below), whose sum is σ = 158295872. Its totient is φ = 79147932.

The previous prime is 118721891. The next prime is 118721903. The reversal of 118721901 is 109127811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 118721901 - 2¹⁵ = 118689133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118721903) 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, 19786981 + ... + 19786986.

It is an arithmetic number, because the mean of its divisors is an integer number (39573968).

Almost surely, 2^118721901 is an apocalyptic number.

It is an amenable number.

118721901 is a deficient number, since it is larger than the sum of its proper divisors (39573971).

118721901 is an equidigital number, since it uses as much as digits as its factorization.

118721901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39573970.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 118721901 is about 10895.9580120336. The cubic root of 118721901 is about 491.4850145507.

The spelling of 118721901 in words is "one hundred eighteen million, seven hundred twenty-one thousand, nine hundred one".