81459025 has 12 divisors (see below), whose sum is σ = 102012444. Its totient is φ = 64520000.

The previous prime is 81459013. The next prime is 81459067. The reversal of 81459025 is 52095418.

It can be written as a sum of positive squares in 6 ways, for example, as 620944 + 80838081 = 788^2 + 8991^2 .

It is not a de Polignac number, because 81459025 - 2¹³ = 81450833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13606 + ... + 18655.

It is an arithmetic number, because the mean of its divisors is an integer number (8501037).

Almost surely, 2^81459025 is an apocalyptic number.

It is an amenable number.

81459025 is a deficient number, since it is larger than the sum of its proper divisors (20553419).

81459025 is a wasteful number, since it uses less digits than its factorization.

81459025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32372 (or 32367 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 81459025 is about 9025.4653619633. The cubic root of 81459025 is about 433.4906512957.

The spelling of 81459025 in words is "eighty-one million, four hundred fifty-nine thousand, twenty-five".