81359607 has 16 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 46443072.

The previous prime is 81359599. The next prime is 81359627. The reversal of 81359607 is 70695318.

It is not a de Polignac number, because 81359607 - 2³ = 81359599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81359627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32803 + ... + 35195.

It is an arithmetic number, because the mean of its divisors is an integer number (7756560).

Almost surely, 2^81359607 is an apocalyptic number.

81359607 is a deficient number, since it is larger than the sum of its proper divisors (42745353).

81359607 is a wasteful number, since it uses less digits than its factorization.

81359607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81359607 is about 9019.9560420215. The cubic root of 81359607 is about 433.3142259162.

The spelling of 81359607 in words is "eighty-one million, three hundred fifty-nine thousand, six hundred seven".