120172491 has 24 divisors (see below), whose sum is σ = 186229680. Its totient is φ = 77347872.

The previous prime is 120172489. The next prime is 120172499. The reversal of 120172491 is 194271021.

120172491 is a `hidden beast` number, since 1 + 2 + 0 + 172 + 491 = 666.

It is not a de Polignac number, because 120172491 - 2¹ = 120172489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (120172499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1480 + ... + 15573.

It is an arithmetic number, because the mean of its divisors is an integer number (7759570).

Almost surely, 2^120172491 is an apocalyptic number.

120172491 is a deficient number, since it is larger than the sum of its proper divisors (66057189).

120172491 is an equidigital number, since it uses as much as digits as its factorization.

120172491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17097 (or 17085 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 120172491 is about 10962.3214238591. The cubic root of 120172491 is about 493.4786347122.

The spelling of 120172491 in words is "one hundred twenty million, one hundred seventy-two thousand, four hundred ninety-one".