172873331 has 4 divisors (see below), whose sum is σ = 172902600. Its totient is φ = 172844064.

The previous prime is 172873307. The next prime is 172873403. The reversal of 172873331 is 133378271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172873331 is a prime.

It is a super-2 number, since 2×172873331² = 59770377142071122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172873291 and 172873300.

It is not an unprimeable number, because it can be changed into a prime (172873301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321 + ... + 18738.

It is an arithmetic number, because the mean of its divisors is an integer number (43225650).

Almost surely, 2^172873331 is an apocalyptic number.

172873331 is a deficient number, since it is larger than the sum of its proper divisors (29269).

172873331 is an equidigital number, since it uses as much as digits as its factorization.

172873331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29268.

The product of its digits is 21168, while the sum is 35.

The square root of 172873331 is about 13148.1303233578. The cubic root of 172873331 is about 557.0694387868.

The spelling of 172873331 in words is "one hundred seventy-two million, eight hundred seventy-three thousand, three hundred thirty-one".