2011631 has 2 divisors, whose sum is σ = 2011632. Its totient is φ = 2011630.

The previous prime is 2011613. The next prime is 2011637. The reversal of 2011631 is 1361102.

Together with previous prime (2011613) 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-2011631 is a prime.

It is a super-2 number, since 2×2011631² = 8093318560322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005815 + 1005816.

It is an arithmetic number, because the mean of its divisors is an integer number (1005816).

2^2011631 is an apocalyptic number.

2011631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011631 is an equidigital number, since it uses as much as digits as its factorization.

2011631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2011631 is about 1418.3197805855. The cubic root of 2011631 is about 126.2358687578.

Adding to 2011631 its reverse (1361102), we get a palindrome (3372733).

The spelling of 2011631 in words is "two million, eleven thousand, six hundred thirty-one".