2643631 has 4 divisors (see below), whose sum is σ = 2657664. Its totient is φ = 2629600.

The previous prime is 2643629. The next prime is 2643647. The reversal of 2643631 is 1363462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1363462 = 2 ⋅681731.

It is a cyclic number.

It is not a de Polignac number, because 2643631 - 2¹ = 2643629 is a prime.

It is a super-2 number, since 2×2643631² = 13977569728322, which contains 22 as substring.

It is a Duffinian number.

2643631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2643596 and 2643605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6730 + ... + 7111.

It is an arithmetic number, because the mean of its divisors is an integer number (664416).

2^2643631 is an apocalyptic number.

2643631 is a deficient number, since it is larger than the sum of its proper divisors (14033).

2643631 is a wasteful number, since it uses less digits than its factorization.

2643631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14032.

The product of its digits is 2592, while the sum is 25.

The square root of 2643631 is about 1625.9246600012. The cubic root of 2643631 is about 138.2717985699.

The spelling of 2643631 in words is "two million, six hundred forty-three thousand, six hundred thirty-one".