2631649 has 2 divisors, whose sum is σ = 2631650. Its totient is φ = 2631648.

The previous prime is 2631647. The next prime is 2631653. The reversal of 2631649 is 9461362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 889249 = 1320^2 + 943^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631649 - 2¹ = 2631647 is a prime.

Together with 2631647, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2²¹ + 6 + 3¹² + 1 + 6⁴ + 4⁵ + 9³ .

It is a self number, because there is not a number n which added to its sum of digits gives 2631649.

It is not a weakly prime, because it can be changed into another prime (2631647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315824 + 1315825.

It is an arithmetic number, because the mean of its divisors is an integer number (1315825).

2^2631649 is an apocalyptic number.

It is an amenable number.

2631649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631649 is an equidigital number, since it uses as much as digits as its factorization.

2631649 is an evil number, because the sum of its binary digits is even.

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

The square root of 2631649 is about 1622.2358028351. The cubic root of 2631649 is about 138.0625810119.

The spelling of 2631649 in words is "two million, six hundred thirty-one thousand, six hundred forty-nine".