2500025581 has 4 divisors (see below), whose sum is σ = 2500199964. Its totient is φ = 2499851200.

The previous prime is 2500025573. The next prime is 2500025603. The reversal of 2500025581 is 1855200052.

2500025581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 759884356 + 1740141225 = 27566^2 + 41715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500025581 - 2³ = 2500025573 is a prime.

It is a super-2 number, since 2×2500025581² = 12500255811308775122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2500028581) 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, 63550 + ... + 95071.

It is an arithmetic number, because the mean of its divisors is an integer number (625049991).

Almost surely, 2^2500025581 is an apocalyptic number.

It is an amenable number.

2500025581 is a deficient number, since it is larger than the sum of its proper divisors (174383).

2500025581 is a wasteful number, since it uses less digits than its factorization.

2500025581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174382.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 2500025581 is about 50000.2558093456. The cubic root of 2500025581 is about 1357.2134374495.

The spelling of 2500025581 in words is "two billion, five hundred million, twenty-five thousand, five hundred eighty-one".