2172431 has 4 divisors (see below), whose sum is σ = 2188200. Its totient is φ = 2156664.

The previous prime is 2172427. The next prime is 2172433. The reversal of 2172431 is 1342712.

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 2172431 - 2² = 2172427 is a prime.

It is a super-2 number, since 2×2172431² = 9438912899522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172433) 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, 7676 + ... + 7953.

It is an arithmetic number, because the mean of its divisors is an integer number (547050).

2^2172431 is an apocalyptic number.

2172431 is a deficient number, since it is larger than the sum of its proper divisors (15769).

2172431 is a wasteful number, since it uses less digits than its factorization.

2172431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15768.

The product of its digits is 336, while the sum is 20.

The square root of 2172431 is about 1473.9168904657. The cubic root of 2172431 is about 129.5135866248.

The spelling of 2172431 in words is "two million, one hundred seventy-two thousand, four hundred thirty-one".