81524801 has 16 divisors (see below), whose sum is σ = 89193600. Its totient is φ = 74245248.

The previous prime is 81524789. The next prime is 81524819. The reversal of 81524801 is 10842518.

It is a cyclic number.

It is not a de Polignac number, because 81524801 - 2¹⁴ = 81508417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81524881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61916 + ... + 63218.

It is an arithmetic number, because the mean of its divisors is an integer number (5574600).

Almost surely, 2^81524801 is an apocalyptic number.

It is an amenable number.

81524801 is a deficient number, since it is larger than the sum of its proper divisors (7668799).

81524801 is a wasteful number, since it uses less digits than its factorization.

81524801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 81524801 is about 9029.1085384992. The cubic root of 81524801 is about 433.6072973024.

The spelling of 81524801 in words is "eighty-one million, five hundred twenty-four thousand, eight hundred one".