91291933 has 2 divisors, whose sum is σ = 91291934. Its totient is φ = 91291932.

The previous prime is 91291867. The next prime is 91291951. The reversal of 91291933 is 33919219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85618009 + 5673924 = 9253^2 + 2382^2 .

It is a cyclic number.

It is not a de Polignac number, because 91291933 - 2¹³ = 91283741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91291892 and 91291901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91291973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45645966 + 45645967.

It is an arithmetic number, because the mean of its divisors is an integer number (45645967).

Almost surely, 2^91291933 is an apocalyptic number.

It is an amenable number.

91291933 is a deficient number, since it is larger than the sum of its proper divisors (1).

91291933 is an equidigital number, since it uses as much as digits as its factorization.

91291933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 37.

The square root of 91291933 is about 9554.6812087060. The cubic root of 91291933 is about 450.2746192067.

The spelling of 91291933 in words is "ninety-one million, two hundred ninety-one thousand, nine hundred thirty-three".