91426649 has 2 divisors, whose sum is σ = 91426650. Its totient is φ = 91426648.

The previous prime is 91426639. The next prime is 91426661. The reversal of 91426649 is 94662419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87759424 + 3667225 = 9368^2 + 1915^2 .

It is an emirp because it is prime and its reverse (94662419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91426649 - 2⁸ = 91426393 is a prime.

It is not a weakly prime, because it can be changed into another prime (91426639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45713324 + 45713325.

It is an arithmetic number, because the mean of its divisors is an integer number (45713325).

Almost surely, 2^91426649 is an apocalyptic number.

It is an amenable number.

91426649 is a deficient number, since it is larger than the sum of its proper divisors (1).

91426649 is an equidigital number, since it uses as much as digits as its factorization.

91426649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 91426649 is about 9561.7283479505. The cubic root of 91426649 is about 450.4959946725.

The spelling of 91426649 in words is "ninety-one million, four hundred twenty-six thousand, six hundred forty-nine".