172081923 has 16 divisors (see below), whose sum is σ = 247393440. Its totient is φ = 105767424.

The previous prime is 172081913. The next prime is 172081957. The reversal of 172081923 is 329180271.

It is a Cunningham number, because it is equal to 13118²-1.

It is not a de Polignac number, because 172081923 - 2⁶ = 172081859 is a prime.

It is a super-2 number, since 2×172081923² = 59224376446755858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172081913) 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, 37165 + ... + 41537.

It is an arithmetic number, because the mean of its divisors is an integer number (15462090).

Almost surely, 2^172081923 is an apocalyptic number.

172081923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

172081923 is a deficient number, since it is larger than the sum of its proper divisors (75311517).

172081923 is a wasteful number, since it uses less digits than its factorization.

172081923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5398.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 172081923 is about 13117.9999618844. Note that the first 4 decimals coincide. The cubic root of 172081923 is about 556.2180568620.

The spelling of 172081923 in words is "one hundred seventy-two million, eighty-one thousand, nine hundred twenty-three".