81254725 has 6 divisors (see below), whose sum is σ = 100755890. Its totient is φ = 65003760.

The previous prime is 81254711. The next prime is 81254753. The reversal of 81254725 is 52745218.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 146689 + 81108036 = 383^2 + 9006^2 .

It is not a de Polignac number, because 81254725 - 2⁹ = 81254213 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1625070 + ... + 1625119.

Almost surely, 2^81254725 is an apocalyptic number.

It is an amenable number.

81254725 is a deficient number, since it is larger than the sum of its proper divisors (19501165).

81254725 is a wasteful number, since it uses less digits than its factorization.

81254725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250199 (or 3250194 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 81254725 is about 9014.1402806923. The cubic root of 81254725 is about 433.1279483637.

The spelling of 81254725 in words is "eighty-one million, two hundred fifty-four thousand, seven hundred twenty-five".