2651639 has 2 divisors, whose sum is σ = 2651640. Its totient is φ = 2651638.

The previous prime is 2651629. The next prime is 2651651. The reversal of 2651639 is 9361562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2651639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2651629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325819 + 1325820.

It is an arithmetic number, because the mean of its divisors is an integer number (1325820).

2^2651639 is an apocalyptic number.

2651639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2651639 is an equidigital number, since it uses as much as digits as its factorization.

2651639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 2651639 is about 1628.3853966429. The cubic root of 2651639 is about 138.4112739599.

The spelling of 2651639 in words is "two million, six hundred fifty-one thousand, six hundred thirty-nine".