2520725081 has 6 divisors (see below), whose sum is σ = 2932272090. Its totient is φ = 2160621456.

The previous prime is 2520725033. The next prime is 2520725093. The reversal of 2520725081 is 1805270252.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2273763856 + 246961225 = 47684^2 + 15715^2 .

It is not a de Polignac number, because 2520725081 - 2¹⁰ = 2520724057 is a prime.

It is a super-2 number, since 2×2520725081² = 12708109867964913122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2520722081) 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, 25721636 + ... + 25721733.

It is an arithmetic number, because the mean of its divisors is an integer number (488712015).

Almost surely, 2^2520725081 is an apocalyptic number.

It is an amenable number.

2520725081 is a deficient number, since it is larger than the sum of its proper divisors (411547009).

2520725081 is an equidigital number, since it uses as much as digits as its factorization.

2520725081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51443383 (or 51443376 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 2520725081 is about 50206.8230522506. The cubic root of 2520725081 is about 1360.9489270218.

The spelling of 2520725081 in words is "two billion, five hundred twenty million, seven hundred twenty-five thousand, eighty-one".