2123831 has 2 divisors, whose sum is σ = 2123832. Its totient is φ = 2123830.

The previous prime is 2123791. The next prime is 2123851. The reversal of 2123831 is 1383212.

It is an a-pointer prime, because the next prime (2123851) can be obtained adding 2123831 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2123831 - 2⁶ = 2123767 is a prime.

It is a super-2 number, since 2×2123831² = 9021316233122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061915 + 1061916.

It is an arithmetic number, because the mean of its divisors is an integer number (1061916).

2^2123831 is an apocalyptic number.

2123831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123831 is an equidigital number, since it uses as much as digits as its factorization.

2123831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 2123831 is about 1457.3369548598. The cubic root of 2123831 is about 128.5405000856.

It can be divided in two parts, 21238 and 31, that multiplied together give a triangular number (658378 = T₁₁₄₇).

The spelling of 2123831 in words is "two million, one hundred twenty-three thousand, eight hundred thirty-one".