2508991 has 4 divisors (see below), whose sum is σ = 2550184. Its totient is φ = 2467800.

The previous prime is 2508971. The next prime is 2509027. The reversal of 2508991 is 1998052.

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-2508991 is a prime.

It is a Duffinian number.

2508991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2508901) 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, 20505 + ... + 20626.

It is an arithmetic number, because the mean of its divisors is an integer number (637546).

2^2508991 is an apocalyptic number.

2508991 is a deficient number, since it is larger than the sum of its proper divisors (41193).

2508991 is an equidigital number, since it uses as much as digits as its factorization.

2508991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41192.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 2508991 is about 1583.9794821903. The cubic root of 2508991 is about 135.8833883631.

The spelling of 2508991 in words is "two million, five hundred eight thousand, nine hundred ninety-one".