2138831 has 2 divisors, whose sum is σ = 2138832. Its totient is φ = 2138830.

The previous prime is 2138813. The next prime is 2138833. The reversal of 2138831 is 1388312.

Together with previous prime (2138813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138831 is a prime.

It is a super-2 number, since 2×2138831² = 9149196093122, which contains 22 as substring.

Together with 2138833, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2138831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069415 + 1069416.

It is an arithmetic number, because the mean of its divisors is an integer number (1069416).

2^2138831 is an apocalyptic number.

2138831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138831 is an equidigital number, since it uses as much as digits as its factorization.

2138831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 2138831 is about 1462.4742732780. The cubic root of 2138831 is about 128.8424051505.

The spelling of 2138831 in words is "two million, one hundred thirty-eight thousand, eight hundred thirty-one".