2581651 has 2 divisors, whose sum is σ = 2581652. Its totient is φ = 2581650.

The previous prime is 2581643. The next prime is 2581669. The reversal of 2581651 is 1561852.

2581651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2581651 - 2³ = 2581643 is a prime.

2581651 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2581951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290825 + 1290826.

It is an arithmetic number, because the mean of its divisors is an integer number (1290826).

2^2581651 is an apocalyptic number.

2581651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581651 is an equidigital number, since it uses as much as digits as its factorization.

2581651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 28.

The square root of 2581651 is about 1606.7516920794. The cubic root of 2581651 is about 137.1826466165.

The spelling of 2581651 in words is "two million, five hundred eighty-one thousand, six hundred fifty-one".