81980589 has 8 divisors (see below), whose sum is σ = 110390112. Its totient is φ = 54112400.

The previous prime is 81980543. The next prime is 81980599. The reversal of 81980589 is 98508918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81980589 - 2⁸ = 81980333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81980599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134979 + ... + 135584.

It is an arithmetic number, because the mean of its divisors is an integer number (13798764).

Almost surely, 2^81980589 is an apocalyptic number.

It is an amenable number.

81980589 is a deficient number, since it is larger than the sum of its proper divisors (28409523).

81980589 is a wasteful number, since it uses less digits than its factorization.

81980589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270667.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 81980589 is about 9054.3132815250. The cubic root of 81980589 is about 434.4138650869.

The spelling of 81980589 in words is "eighty-one million, nine hundred eighty thousand, five hundred eighty-nine".