91001818273 has 2 divisors, whose sum is σ = 91001818274. Its totient is φ = 91001818272.

The previous prime is 91001818183. The next prime is 91001818279. The reversal of 91001818273 is 37281810019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90738307984 + 263510289 = 301228^2 + 16233^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91001818273 is a prime.

It is not a weakly prime, because it can be changed into another prime (91001818279) 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, 45500909136 + 45500909137.

It is an arithmetic number, because the mean of its divisors is an integer number (45500909137).

Almost surely, 2^91001818273 is an apocalyptic number.

It is an amenable number.

91001818273 is a deficient number, since it is larger than the sum of its proper divisors (1).

91001818273 is an equidigital number, since it uses as much as digits as its factorization.

91001818273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The spelling of 91001818273 in words is "ninety-one billion, one million, eight hundred eighteen thousand, two hundred seventy-three".