91382438489 has 2 divisors, whose sum is σ = 91382438490. Its totient is φ = 91382438488.

The previous prime is 91382438471. The next prime is 91382438573. The reversal of 91382438489 is 98483428319.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57123390025 + 34259048464 = 239005^2 + 185092^2 .

It is a cyclic number.

It is not a de Polignac number, because 91382438489 - 2¹⁶ = 91382372953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91382438989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45691219244 + 45691219245.

It is an arithmetic number, because the mean of its divisors is an integer number (45691219245).

Almost surely, 2^91382438489 is an apocalyptic number.

It is an amenable number.

91382438489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91382438489 is an equidigital number, since it uses as much as digits as its factorization.

91382438489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 59.

The spelling of 91382438489 in words is "ninety-one billion, three hundred eighty-two million, four hundred thirty-eight thousand, four hundred eighty-nine".