91024243987 has 2 divisors, whose sum is σ = 91024243988. Its totient is φ = 91024243986.

The previous prime is 91024243909. The next prime is 91024244009. The reversal of 91024243987 is 78934242019.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91024243987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91024243987.

It is not a weakly prime, because it can be changed into another prime (91024243907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45512121993 + 45512121994.

It is an arithmetic number, because the mean of its divisors is an integer number (45512121994).

Almost surely, 2^91024243987 is an apocalyptic number.

91024243987 is a deficient number, since it is larger than the sum of its proper divisors (1).

91024243987 is an equidigital number, since it uses as much as digits as its factorization.

91024243987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 91024243987 in words is "ninety-one billion, twenty-four million, two hundred forty-three thousand, nine hundred eighty-seven".