81246529 has 16 divisors (see below), whose sum is σ = 100925440. Its totient is φ = 63685440.

The previous prime is 81246499. The next prime is 81246541. The reversal of 81246529 is 92564218.

It is not a de Polignac number, because 81246529 - 2⁵ = 81246497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81246559) 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, 5824 + ... + 14014.

It is an arithmetic number, because the mean of its divisors is an integer number (6307840).

Almost surely, 2^81246529 is an apocalyptic number.

It is an amenable number.

81246529 is a deficient number, since it is larger than the sum of its proper divisors (19678911).

81246529 is a wasteful number, since it uses less digits than its factorization.

81246529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320.

The product of its digits is 34560, while the sum is 37.

The square root of 81246529 is about 9013.6856501655. The cubic root of 81246529 is about 433.1133849602.

The spelling of 81246529 in words is "eighty-one million, two hundred forty-six thousand, five hundred twenty-nine".