81700589 has 12 divisors (see below), whose sum is σ = 91363200. Its totient is φ = 72842688.

The previous prime is 81700583. The next prime is 81700601. The reversal of 81700589 is 98500718.

It is not a de Polignac number, because 81700589 - 2⁴ = 81700573 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 (81700583) 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 11 ways as a sum of consecutive naturals, for example, 1949 + ... + 12930.

It is an arithmetic number, because the mean of its divisors is an integer number (7613600).

Almost surely, 2^81700589 is an apocalyptic number.

It is an amenable number.

81700589 is a deficient number, since it is larger than the sum of its proper divisors (9662611).

81700589 is a wasteful number, since it uses less digits than its factorization.

81700589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14932 (or 14915 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 81700589 is about 9038.8378124624. The cubic root of 81700589 is about 433.9187290749.

The spelling of 81700589 in words is "eighty-one million, seven hundred thousand, five hundred eighty-nine".