91864801901 has 2 divisors, whose sum is σ = 91864801902. Its totient is φ = 91864801900.

The previous prime is 91864801817. The next prime is 91864801907. The reversal of 91864801901 is 10910846819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73169709001 + 18695092900 = 270499^2 + 136730^2 .

It is a cyclic number.

It is not a de Polignac number, because 91864801901 - 2¹⁸ = 91864539757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91864801907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45932400950 + 45932400951.

It is an arithmetic number, because the mean of its divisors is an integer number (45932400951).

Almost surely, 2^91864801901 is an apocalyptic number.

It is an amenable number.

91864801901 is a deficient number, since it is larger than the sum of its proper divisors (1).

91864801901 is an equidigital number, since it uses as much as digits as its factorization.

91864801901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 47.

The spelling of 91864801901 in words is "ninety-one billion, eight hundred sixty-four million, eight hundred one thousand, nine hundred one".