2505731 has 4 divisors (see below), whose sum is σ = 2511672. Its totient is φ = 2499792.

The previous prime is 2505707. The next prime is 2505743. The reversal of 2505731 is 1375052.

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

It is a cyclic number.

It is not a de Polignac number, because 2505731 - 2¹⁸ = 2243587 is a prime.

It is a super-2 number, since 2×2505731² = 12557375688722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2505697 and 2505706.

It is not an unprimeable number, because it can be changed into a prime (2505791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2285 + ... + 3198.

It is an arithmetic number, because the mean of its divisors is an integer number (627918).

2^2505731 is an apocalyptic number.

2505731 is a deficient number, since it is larger than the sum of its proper divisors (5941).

2505731 is an equidigital number, since it uses as much as digits as its factorization.

2505731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 2505731 is about 1582.9500939701. The cubic root of 2505731 is about 135.8245105322.

The spelling of 2505731 in words is "two million, five hundred five thousand, seven hundred thirty-one".