120815191 has 4 divisors (see below), whose sum is σ = 138074512. Its totient is φ = 103555872.

The previous prime is 120815087. The next prime is 120815203. The reversal of 120815191 is 191518021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 120815191 - 2⁹ = 120814679 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 (120815791) 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, 8629650 + ... + 8629663.

It is an arithmetic number, because the mean of its divisors is an integer number (34518628).

Almost surely, 2^120815191 is an apocalyptic number.

120815191 is a deficient number, since it is larger than the sum of its proper divisors (17259321).

120815191 is an equidigital number, since it uses as much as digits as its factorization.

120815191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17259320.

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

The square root of 120815191 is about 10991.5963808721. The cubic root of 120815191 is about 494.3568029357.

The spelling of 120815191 in words is "one hundred twenty million, eight hundred fifteen thousand, one hundred ninety-one".