2563731 has 20 divisors (see below), whose sum is σ = 3957184. Its totient is φ = 1652400.

The previous prime is 2563723. The next prime is 2563733. The reversal of 2563731 is 1373652.

It is a happy number.

2563731 is a `hidden beast` number, since 25 + 637 + 3 + 1 = 666.

It is not a de Polignac number, because 2563731 - 2³ = 2563723 is a prime.

It is a super-2 number, since 2×2563731² = 13145433280722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

2563731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2563695 and 2563704.

It is not an unprimeable number, because it can be changed into a prime (2563733) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2001 + ... + 3021.

2^2563731 is an apocalyptic number.

2563731 is a deficient number, since it is larger than the sum of its proper divisors (1393453).

2563731 is a wasteful number, since it uses less digits than its factorization.

2563731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1055 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 2563731 is about 1601.1655129936. The cubic root of 2563731 is about 136.8645009774.

The spelling of 2563731 in words is "two million, five hundred sixty-three thousand, seven hundred thirty-one".