91633397 has 2 divisors, whose sum is σ = 91633398. Its totient is φ = 91633396.

The previous prime is 91633369. The next prime is 91633439. The reversal of 91633397 is 79333619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82428241 + 9205156 = 9079^2 + 3034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91633397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91633307) 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, 45816698 + 45816699.

It is an arithmetic number, because the mean of its divisors is an integer number (45816699).

Almost surely, 2^91633397 is an apocalyptic number.

It is an amenable number.

91633397 is a deficient number, since it is larger than the sum of its proper divisors (1).

91633397 is an equidigital number, since it uses as much as digits as its factorization.

91633397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 41.

The square root of 91633397 is about 9572.5334682100. The cubic root of 91633397 is about 450.8353159686.

The spelling of 91633397 in words is "ninety-one million, six hundred thirty-three thousand, three hundred ninety-seven".