91865147293 has 2 divisors, whose sum is σ = 91865147294. Its totient is φ = 91865147292.

The previous prime is 91865147273. The next prime is 91865147441. The reversal of 91865147293 is 39274156819.

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., 54549339364 + 37315807929 = 233558^2 + 193173^2 .

It is a cyclic number.

It is not a de Polignac number, because 91865147293 - 2⁵ = 91865147261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91865147203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932573646 + 45932573647.

It is an arithmetic number, because the mean of its divisors is an integer number (45932573647).

Almost surely, 2^91865147293 is an apocalyptic number.

It is an amenable number.

91865147293 is a deficient number, since it is larger than the sum of its proper divisors (1).

91865147293 is an equidigital number, since it uses as much as digits as its factorization.

91865147293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 91865147293 in words is "ninety-one billion, eight hundred sixty-five million, one hundred forty-seven thousand, two hundred ninety-three".