2591887 has 4 divisors (see below), whose sum is σ = 2661976. Its totient is φ = 2521800.

The previous prime is 2591857. The next prime is 2591891. The reversal of 2591887 is 7881952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2591887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34989 + ... + 35062.

It is an arithmetic number, because the mean of its divisors is an integer number (665494).

2^2591887 is an apocalyptic number.

2591887 is a deficient number, since it is larger than the sum of its proper divisors (70089).

2591887 is an equidigital number, since it uses as much as digits as its factorization.

2591887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70088.

The product of its digits is 40320, while the sum is 40.

The square root of 2591887 is about 1609.9338495727. The cubic root of 2591887 is about 137.3637128936.

The spelling of 2591887 in words is "two million, five hundred ninety-one thousand, eight hundred eighty-seven".