2649631 has 4 divisors (see below), whose sum is σ = 2694600. Its totient is φ = 2604664.

The previous prime is 2649613. The next prime is 2649677. The reversal of 2649631 is 1369462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1369462 = 2 ⋅684731.

It is a cyclic number.

It is not a de Polignac number, because 2649631 - 2⁷ = 2649503 is a prime.

It is a super-2 number, since 2×2649631² = 14041088872322, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁷ + 6 + 4¹⁰ + 9⁴ + 6² + 3¹³ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2649593 and 2649602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649611) 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, 22396 + ... + 22513.

It is an arithmetic number, because the mean of its divisors is an integer number (673650).

2^2649631 is an apocalyptic number.

2649631 is a deficient number, since it is larger than the sum of its proper divisors (44969).

2649631 is an equidigital number, since it uses as much as digits as its factorization.

2649631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44968.

The product of its digits is 7776, while the sum is 31.

The square root of 2649631 is about 1627.7687182152. The cubic root of 2649631 is about 138.3763270179.

The spelling of 2649631 in words is "two million, six hundred forty-nine thousand, six hundred thirty-one".