2631291 has 32 divisors (see below), whose sum is σ = 4112640. Its totient is φ = 1482624.

The previous prime is 2631283. The next prime is 2631323. The reversal of 2631291 is 1921362.

Added to its reverse (1921362) it gives a triangular number (4552653 = T₃₀₁₇).

2631291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2631291 - 2³ = 2631283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39240 + ... + 39306.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2^2631291 is an apocalyptic number.

2631291 is a deficient number, since it is larger than the sum of its proper divisors (1481349).

2631291 is a wasteful number, since it uses less digits than its factorization.

2631291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155.

The product of its digits is 648, while the sum is 24.

The square root of 2631291 is about 1622.1254575402. The cubic root of 2631291 is about 138.0563202168.

Adding to 2631291 its reverse (1921362), we get a triangular number (4552653 = T₃₀₁₇).

The spelling of 2631291 in words is "two million, six hundred thirty-one thousand, two hundred ninety-one".