81092989903 has 2 divisors, whose sum is σ = 81092989904. Its totient is φ = 81092989902.

The previous prime is 81092989849. The next prime is 81092989937. The reversal of 81092989903 is 30998929018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81092989903 - 2³³ = 72503055311 is a prime.

It is a super-2 number, since 2×81092989903² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81092981903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40546494951 + 40546494952.

It is an arithmetic number, because the mean of its divisors is an integer number (40546494952).

Almost surely, 2^81092989903 is an apocalyptic number.

81092989903 is a deficient number, since it is larger than the sum of its proper divisors (1).

81092989903 is an equidigital number, since it uses as much as digits as its factorization.

81092989903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 58.

The spelling of 81092989903 in words is "eighty-one billion, ninety-two million, nine hundred eighty-nine thousand, nine hundred three".