2581687 has 2 divisors, whose sum is σ = 2581688. Its totient is φ = 2581686.

The previous prime is 2581673. The next prime is 2581697. The reversal of 2581687 is 7861852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2581687 - 2⁷ = 2581559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290843 + 1290844.

It is an arithmetic number, because the mean of its divisors is an integer number (1290844).

2^2581687 is an apocalyptic number.

2581687 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581687 is an equidigital number, since it uses as much as digits as its factorization.

2581687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 2581687 is about 1606.7628947670. The cubic root of 2581687 is about 137.1832842643.

The spelling of 2581687 in words is "two million, five hundred eighty-one thousand, six hundred eighty-seven".