2131923 has 4 divisors (see below), whose sum is σ = 2842568. Its totient is φ = 1421280.

The previous prime is 2131907. The next prime is 2131937. The reversal of 2131923 is 3291312.

It is a happy number.

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

It is not a de Polignac number, because 2131923 - 2⁴ = 2131907 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2131923.

It is not an unprimeable number, because it can be changed into a prime (2131223) 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, 355318 + ... + 355323.

It is an arithmetic number, because the mean of its divisors is an integer number (710642).

2^2131923 is an apocalyptic number.

2131923 is a deficient number, since it is larger than the sum of its proper divisors (710645).

2131923 is an equidigital number, since it uses as much as digits as its factorization.

2131923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710644.

The product of its digits is 324, while the sum is 21.

The square root of 2131923 is about 1460.1106122483. The cubic root of 2131923 is about 128.7035437384.

The spelling of 2131923 in words is "two million, one hundred thirty-one thousand, nine hundred twenty-three".