120172157 has 6 divisors (see below), whose sum is σ = 139792158. Its totient is φ = 103004664.

The previous prime is 120172141. The next prime is 120172159. The reversal of 120172157 is 751271021.

It can be written as a sum of positive squares in only one way, i.e., 80658361 + 39513796 = 8981^2 + 6286^2 .

It is not a de Polignac number, because 120172157 - 2⁴ = 120172141 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 (120172159) 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 5 ways as a sum of consecutive naturals, for example, 1226198 + ... + 1226295.

It is an arithmetic number, because the mean of its divisors is an integer number (23298693).

Almost surely, 2^120172157 is an apocalyptic number.

It is an amenable number.

120172157 is a deficient number, since it is larger than the sum of its proper divisors (19620001).

120172157 is an equidigital number, since it uses as much as digits as its factorization.

120172157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452507 (or 2452500 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 120172157 is about 10962.3061898489. The cubic root of 120172157 is about 493.4781775304.

The spelling of 120172157 in words is "one hundred twenty million, one hundred seventy-two thousand, one hundred fifty-seven".