2087831 has 2 divisors, whose sum is σ = 2087832. Its totient is φ = 2087830.

The previous prime is 2087809. The next prime is 2087837. The reversal of 2087831 is 1387802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2087831 - 2¹⁸ = 1825687 is a prime.

It is a super-2 number, since 2×2087831² = 8718076569122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2087794 and 2087803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2087837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043915 + 1043916.

It is an arithmetic number, because the mean of its divisors is an integer number (1043916).

2^2087831 is an apocalyptic number.

2087831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2087831 is an equidigital number, since it uses as much as digits as its factorization.

2087831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 2087831 is about 1444.9328704130. The cubic root of 2087831 is about 127.8100821214.

Subtracting from 2087831 its sum of digits (29), we obtain a palindrome (2087802).

The spelling of 2087831 in words is "two million, eighty-seven thousand, eight hundred thirty-one".