91865147441 has 2 divisors, whose sum is σ = 91865147442. Its totient is φ = 91865147440.

The previous prime is 91865147293. The next prime is 91865147461. The reversal of 91865147441 is 14474156819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89343601216 + 2521546225 = 298904^2 + 50215^2 .

It is an emirp because it is prime and its reverse (14474156819) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91865147441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91865147441.

It is not a weakly prime, because it can be changed into another prime (91865147461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932573720 + 45932573721.

It is an arithmetic number, because the mean of its divisors is an integer number (45932573721).

Almost surely, 2^91865147441 is an apocalyptic number.

It is an amenable number.

91865147441 is a deficient number, since it is larger than the sum of its proper divisors (1).

91865147441 is an equidigital number, since it uses as much as digits as its factorization.

91865147441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The spelling of 91865147441 in words is "ninety-one billion, eight hundred sixty-five million, one hundred forty-seven thousand, four hundred forty-one".