91340261 has 2 divisors, whose sum is σ = 91340262. Its totient is φ = 91340260.

The previous prime is 91340257. The next prime is 91340287. The reversal of 91340261 is 16204319.

It is an a-pointer prime, because the next prime (91340287) can be obtained adding 91340261 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89397025 + 1943236 = 9455^2 + 1394^2 .

It is a cyclic number.

It is not a de Polignac number, because 91340261 - 2² = 91340257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91340261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91340761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45670130 + 45670131.

It is an arithmetic number, because the mean of its divisors is an integer number (45670131).

Almost surely, 2^91340261 is an apocalyptic number.

It is an amenable number.

91340261 is a deficient number, since it is larger than the sum of its proper divisors (1).

91340261 is an equidigital number, since it uses as much as digits as its factorization.

91340261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 91340261 is about 9557.2098961988. The cubic root of 91340261 is about 450.3540604465.

The spelling of 91340261 in words is "ninety-one million, three hundred forty thousand, two hundred sixty-one".