2631645 has 12 divisors (see below), whose sum is σ = 4561596. Its totient is φ = 1403520.

The previous prime is 2631631. The next prime is 2631647. The reversal of 2631645 is 5461362.

It can be written as a sum of positive squares in 2 ways, for example, as 1920996 + 710649 = 1386^2 + 843^2 .

It is not a de Polignac number, because 2631645 - 2⁶ = 2631581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29196 + ... + 29285.

It is an arithmetic number, because the mean of its divisors is an integer number (380133).

2^2631645 is an apocalyptic number.

It is an amenable number.

2631645 is a deficient number, since it is larger than the sum of its proper divisors (1929951).

2631645 is a wasteful number, since it uses less digits than its factorization.

2631645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58492 (or 58489 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2631645 is about 1622.2345699682. The cubic root of 2631645 is about 138.0625110620.

It can be divided in two parts, 263164 and 5, that added together give a square (263169 = 513²).

The spelling of 2631645 in words is "two million, six hundred thirty-one thousand, six hundred forty-five".