81037325 has 12 divisors (see below), whose sum is σ = 100627488. Its totient is φ = 64738800.

The previous prime is 81037301. The next prime is 81037343. The reversal of 81037325 is 52373018.

It is not a de Polignac number, because 81037325 - 2¹² = 81033229 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, 20240 + ... + 23910.

It is an arithmetic number, because the mean of its divisors is an integer number (8385624).

Almost surely, 2^81037325 is an apocalyptic number.

It is an amenable number.

81037325 is a deficient number, since it is larger than the sum of its proper divisors (19590163).

81037325 is a wasteful number, since it uses less digits than its factorization.

81037325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4564 (or 4559 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81037325 is about 9002.0733722849. The cubic root of 81037325 is about 432.7413201030.

The spelling of 81037325 in words is "eighty-one million, thirty-seven thousand, three hundred twenty-five".