81525246 has 32 divisors (see below), whose sum is σ = 179884800. Its totient is φ = 24425280.

The previous prime is 81525211. The next prime is 81525247. The reversal of 81525246 is 64252518.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81525247) 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, 1066 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (5621400).

Almost surely, 2^81525246 is an apocalyptic number.

81525246 is an abundant number, since it is smaller than the sum of its proper divisors (98359554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81525246 is a wasteful number, since it uses less digits than its factorization.

81525246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13984.

The product of its digits is 19200, while the sum is 33.

The square root of 81525246 is about 9029.1331809870. The cubic root of 81525246 is about 433.6080862439.

The spelling of 81525246 in words is "eighty-one million, five hundred twenty-five thousand, two hundred forty-six".