91375789 has 2 divisors, whose sum is σ = 91375790. Its totient is φ = 91375788.

The previous prime is 91375783. The next prime is 91375813. The reversal of 91375789 is 98757319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85932900 + 5442889 = 9270^2 + 2333^2 .

It is a cyclic number.

It is not a de Polignac number, because 91375789 - 2¹¹ = 91373741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91375783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45687894 + 45687895.

It is an arithmetic number, because the mean of its divisors is an integer number (45687895).

Almost surely, 2^91375789 is an apocalyptic number.

It is an amenable number.

91375789 is a deficient number, since it is larger than the sum of its proper divisors (1).

91375789 is an equidigital number, since it uses as much as digits as its factorization.

91375789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 49.

The square root of 91375789 is about 9559.0684169536. The cubic root of 91375789 is about 450.4124432627.

The spelling of 91375789 in words is "ninety-one million, three hundred seventy-five thousand, seven hundred eighty-nine".