157173909 has 8 divisors (see below), whose sum is σ = 220595040. Its totient is φ = 99267696.

The previous prime is 157173883. The next prime is 157173917. The reversal of 157173909 is 909371751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157173909 - 2⁹ = 157173397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157173209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378662 + ... + 1378775.

It is an arithmetic number, because the mean of its divisors is an integer number (27574380).

Almost surely, 2^157173909 is an apocalyptic number.

157173909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

157173909 is a deficient number, since it is larger than the sum of its proper divisors (63421131).

157173909 is a wasteful number, since it uses less digits than its factorization.

157173909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757459.

The product of its (nonzero) digits is 59535, while the sum is 42.

The square root of 157173909 is about 12536.9018900205. The cubic root of 157173909 is about 539.6681877865.

The spelling of 157173909 in words is "one hundred fifty-seven million, one hundred seventy-three thousand, nine hundred nine".