120173991 has 16 divisors (see below), whose sum is σ = 183277824. Its totient is φ = 68612544.

The previous prime is 120173951. The next prime is 120174007. The reversal of 120173991 is 199371021.

It is not a de Polignac number, because 120173991 - 2⁹ = 120173479 is a prime.

It is a super-2 number, since 2×120173991² = 28883576225736162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120173951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40635 + ... + 43491.

It is an arithmetic number, because the mean of its divisors is an integer number (11454864).

Almost surely, 2^120173991 is an apocalyptic number.

120173991 is a deficient number, since it is larger than the sum of its proper divisors (63103833).

120173991 is a wasteful number, since it uses less digits than its factorization.

120173991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4870.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 120173991 is about 10962.3898398114. The cubic root of 120173991 is about 493.4806879133.

The spelling of 120173991 in words is "one hundred twenty million, one hundred seventy-three thousand, nine hundred ninety-one".