81536701 has 4 divisors (see below), whose sum is σ = 81608572. Its totient is φ = 81464832.

The previous prime is 81536669. The next prime is 81536711. The reversal of 81536701 is 10763518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53436100 + 28100601 = 7310^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 81536701 - 2⁵ = 81536669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81536711) 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, 34206 + ... + 36511.

It is an arithmetic number, because the mean of its divisors is an integer number (20402143).

Almost surely, 2^81536701 is an apocalyptic number.

It is an amenable number.

81536701 is a deficient number, since it is larger than the sum of its proper divisors (71871).

81536701 is a wasteful number, since it uses less digits than its factorization.

81536701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71870.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 81536701 is about 9029.7674942382. The cubic root of 81536701 is about 433.6283938511.

The spelling of 81536701 in words is "eighty-one million, five hundred thirty-six thousand, seven hundred one".