91287371029 has 2 divisors, whose sum is σ = 91287371030. Its totient is φ = 91287371028.

The previous prime is 91287370961. The next prime is 91287371047. The reversal of 91287371029 is 92017378219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75626100004 + 15661271025 = 275002^2 + 125145^2 .

It is a cyclic number.

It is not a de Polignac number, because 91287371029 - 2⁷ = 91287370901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91287371089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45643685514 + 45643685515.

It is an arithmetic number, because the mean of its divisors is an integer number (45643685515).

Almost surely, 2^91287371029 is an apocalyptic number.

It is an amenable number.

91287371029 is a deficient number, since it is larger than the sum of its proper divisors (1).

91287371029 is an equidigital number, since it uses as much as digits as its factorization.

91287371029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 91287371029 in words is "ninety-one billion, two hundred eighty-seven million, three hundred seventy-one thousand, twenty-nine".