81361050589 has 16 divisors (see below), whose sum is σ = 103366896640. Its totient is φ = 62297009280.

The previous prime is 81361050539. The next prime is 81361050599. The reversal of 81361050589 is 98505016318.

It is a cyclic number.

It is not a de Polignac number, because 81361050589 - 2⁷ = 81361050461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81361050539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14417784 + ... + 14423425.

It is an arithmetic number, because the mean of its divisors is an integer number (6460431040).

Almost surely, 2^81361050589 is an apocalyptic number.

It is an amenable number.

81361050589 is a deficient number, since it is larger than the sum of its proper divisors (22005846051).

81361050589 is a wasteful number, since it uses less digits than its factorization.

81361050589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28841260.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 81361050589 in words is "eighty-one billion, three hundred sixty-one million, fifty thousand, five hundred eighty-nine".