2015831 has 2 divisors, whose sum is σ = 2015832. Its totient is φ = 2015830.

The previous prime is 2015801. The next prime is 2015833. The reversal of 2015831 is 1385102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2015831 is a prime.

It is a super-2 number, since 2×2015831² = 8127149241122, which contains 22 as substring.

Together with 2015833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2015833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007915 + 1007916.

It is an arithmetic number, because the mean of its divisors is an integer number (1007916).

2^2015831 is an apocalyptic number.

2015831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015831 is an equidigital number, since it uses as much as digits as its factorization.

2015831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2015831 is about 1419.7996337512. The cubic root of 2015831 is about 126.3236618784.

It can be divided in two parts, 20 and 15831, that added together give a palindrome (15851).

The spelling of 2015831 in words is "two million, fifteen thousand, eight hundred thirty-one".