2491251 has 16 divisors (see below), whose sum is σ = 3838464. Its totient is φ = 1407744.

The previous prime is 2491243. The next prime is 2491259. The reversal of 2491251 is 1521942.

It is an interprime number because it is at equal distance from previous prime (2491243) and next prime (2491259).

It is not a de Polignac number, because 2491251 - 2³ = 2491243 is a prime.

2491251 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2491259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (239904).

2^2491251 is an apocalyptic number.

2491251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2491251 is a deficient number, since it is larger than the sum of its proper divisors (1347213).

2491251 is a wasteful number, since it uses less digits than its factorization.

2491251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330.

The product of its digits is 720, while the sum is 24.

The square root of 2491251 is about 1578.3697285490. The cubic root of 2491251 is about 135.5623728493.

The spelling of 2491251 in words is "two million, four hundred ninety-one thousand, two hundred fifty-one".