2563491 has 16 divisors (see below), whose sum is σ = 3974400. Its totient is φ = 1439328.

The previous prime is 2563489. The next prime is 2563493. The reversal of 2563491 is 1943652.

It is an interprime number because it is at equal distance from previous prime (2563489) and next prime (2563493).

It is not a de Polignac number, because 2563491 - 2¹ = 2563489 is a prime.

It is a super-2 number, since 2×2563491² = 13142972214162, which contains 22 as substring.

2563491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2563493) 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, 205 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (248400).

2^2563491 is an apocalyptic number.

2563491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2563491 is a deficient number, since it is larger than the sum of its proper divisors (1410909).

2563491 is a wasteful number, since it uses less digits than its factorization.

2563491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138.

The product of its digits is 6480, while the sum is 30.

The square root of 2563491 is about 1601.0905658332. The cubic root of 2563491 is about 136.8602300528.

The spelling of 2563491 in words is "two million, five hundred sixty-three thousand, four hundred ninety-one".