2631631 has 2 divisors, whose sum is σ = 2631632. Its totient is φ = 2631630.

The previous prime is 2631581. The next prime is 2631647. The reversal of 2631631 is 1361362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2631631 - 2¹⁷ = 2500559 is a prime.

It is a super-2 number, since 2×2631631² = 13850963440322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2631661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315815 + 1315816.

It is an arithmetic number, because the mean of its divisors is an integer number (1315816).

2^2631631 is an apocalyptic number.

2631631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631631 is an equidigital number, since it uses as much as digits as its factorization.

2631631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

The square root of 2631631 is about 1622.2302549268. The cubic root of 2631631 is about 138.0622662369.

Adding to 2631631 its reverse (1361362), we get a palindrome (3992993).

The spelling of 2631631 in words is "two million, six hundred thirty-one thousand, six hundred thirty-one".