172882921 has 4 divisors (see below), whose sum is σ = 175813200. Its totient is φ = 169952644.

The previous prime is 172882901. The next prime is 172882951. The reversal of 172882921 is 129288271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172882921 - 2¹⁷ = 172751849 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172882901) 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, 1465051 + ... + 1465168.

It is an arithmetic number, because the mean of its divisors is an integer number (43953300).

Almost surely, 2^172882921 is an apocalyptic number.

It is an amenable number.

172882921 is a deficient number, since it is larger than the sum of its proper divisors (2930279).

172882921 is an equidigital number, since it uses as much as digits as its factorization.

172882921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930278.

The product of its digits is 32256, while the sum is 40.

The square root of 172882921 is about 13148.4950089354. The cubic root of 172882921 is about 557.0797395797.

The spelling of 172882921 in words is "one hundred seventy-two million, eight hundred eighty-two thousand, nine hundred twenty-one".