81345524 has 12 divisors (see below), whose sum is σ = 153305124. Its totient is φ = 37544064.

The previous prime is 81345521. The next prime is 81345529. The reversal of 81345524 is 42554318.

It can be written as a sum of positive squares in 2 ways, for example, as 33292900 + 48052624 = 5770^2 + 6932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81345521) 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, 782117 + ... + 782220.

It is an arithmetic number, because the mean of its divisors is an integer number (12775427).

Almost surely, 2^81345524 is an apocalyptic number.

It is an amenable number.

81345524 is a deficient number, since it is larger than the sum of its proper divisors (71959600).

81345524 is a wasteful number, since it uses less digits than its factorization.

81345524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564354 (or 1564352 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 81345524 is about 9019.1753503300. The cubic root of 81345524 is about 433.2892228604.

The spelling of 81345524 in words is "eighty-one million, three hundred forty-five thousand, five hundred twenty-four".