91988533019 has 2 divisors, whose sum is σ = 91988533020. Its totient is φ = 91988533018.

The previous prime is 91988532997. The next prime is 91988533027. The reversal of 91988533019 is 91033588919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91988533019 - 2⁸ = 91988532763 is a prime.

It is a super-2 number, since 2×91988533019² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91988563019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45994266509 + 45994266510.

It is an arithmetic number, because the mean of its divisors is an integer number (45994266510).

Almost surely, 2^91988533019 is an apocalyptic number.

91988533019 is a deficient number, since it is larger than the sum of its proper divisors (1).

91988533019 is an equidigital number, since it uses as much as digits as its factorization.

91988533019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 56.

The spelling of 91988533019 in words is "ninety-one billion, nine hundred eighty-eight million, five hundred thirty-three thousand, nineteen".