2172931 has 4 divisors (see below), whose sum is σ = 2176200. Its totient is φ = 2169664.

The previous prime is 2172917. The next prime is 2172943. The reversal of 2172931 is 1392712.

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

It is a cyclic number.

It is not a de Polignac number, because 2172931 - 2⁷ = 2172803 is a prime.

It is a super-2 number, since 2×2172931² = 9443258261522, 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 = 2172896 and 2172905.

It is not an unprimeable number, because it can be changed into a prime (2172901) 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, 241 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (544050).

2^2172931 is an apocalyptic number.

2172931 is a deficient number, since it is larger than the sum of its proper divisors (3269).

2172931 is an equidigital number, since it uses as much as digits as its factorization.

2172931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268.

The product of its digits is 756, while the sum is 25.

The square root of 2172931 is about 1474.0864967837. The cubic root of 2172931 is about 129.5235220114.

The spelling of 2172931 in words is "two million, one hundred seventy-two thousand, nine hundred thirty-one".