2591987 has 2 divisors, whose sum is σ = 2591988. Its totient is φ = 2591986.

The previous prime is 2591971. The next prime is 2592043. The reversal of 2591987 is 7891952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2591987 - 2⁴ = 2591971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2591917) 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, 1295993 + 1295994.

It is an arithmetic number, because the mean of its divisors is an integer number (1295994).

2^2591987 is an apocalyptic number.

2591987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2591987 is an equidigital number, since it uses as much as digits as its factorization.

2591987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 41.

The square root of 2591987 is about 1609.9649064498. The cubic root of 2591987 is about 137.3654794566.

The spelling of 2591987 in words is "two million, five hundred ninety-one thousand, nine hundred eighty-seven".