2531905 has 4 divisors (see below), whose sum is σ = 3038292. Its totient is φ = 2025520.

The previous prime is 2531891. The next prime is 2531917. The reversal of 2531905 is 5091352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1468944 + 1062961 = 1212^2 + 1031^2 .

It is not a de Polignac number, because 2531905 - 2⁷ = 2531777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2531905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253186 + ... + 253195.

It is an arithmetic number, because the mean of its divisors is an integer number (759573).

2^2531905 is an apocalyptic number.

It is an amenable number.

2531905 is a deficient number, since it is larger than the sum of its proper divisors (506387).

2531905 is an equidigital number, since it uses as much as digits as its factorization.

2531905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506386.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 2531905 is about 1591.1960909957. The cubic root of 2531905 is about 136.2957986485.

The spelling of 2531905 in words is "two million, five hundred thirty-one thousand, nine hundred five".