2563551 has 6 divisors (see below), whose sum is σ = 3702920. Its totient is φ = 1709028.

The previous prime is 2563543. The next prime is 2563553. The reversal of 2563551 is 1553652.

2563551 is a `hidden beast` number, since 25 + 635 + 5 + 1 = 666.

It is not a de Polignac number, because 2563551 - 2³ = 2563543 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 (2563553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142411 + ... + 142428.

2^2563551 is an apocalyptic number.

2563551 is a deficient number, since it is larger than the sum of its proper divisors (1139369).

2563551 is a wasteful number, since it uses less digits than its factorization.

2563551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284845 (or 284842 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 2563551 is about 1601.1093029522. The cubic root of 2563551 is about 136.8612978089.

The spelling of 2563551 in words is "two million, five hundred sixty-three thousand, five hundred fifty-one".