81036529 has 4 divisors (see below), whose sum is σ = 92613184. Its totient is φ = 69459876.

The previous prime is 81036499. The next prime is 81036533. The reversal of 81036529 is 92563018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81036529 - 2¹⁵ = 81003761 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81036494 and 81036503.

It is not an unprimeable number, because it can be changed into a prime (81036829) 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, 5788317 + ... + 5788330.

It is an arithmetic number, because the mean of its divisors is an integer number (23153296).

Almost surely, 2^81036529 is an apocalyptic number.

It is an amenable number.

81036529 is a deficient number, since it is larger than the sum of its proper divisors (11576655).

81036529 is a wasteful number, since it uses less digits than its factorization.

81036529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11576654.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81036529 is about 9002.0291601394. The cubic root of 81036529 is about 432.7399032118.

The spelling of 81036529 in words is "eighty-one million, thirty-six thousand, five hundred twenty-nine".