91867121 has 2 divisors, whose sum is σ = 91867122. Its totient is φ = 91867120.

The previous prime is 91867091. The next prime is 91867141. The reversal of 91867121 is 12176819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80550625 + 11316496 = 8975^2 + 3364^2 .

It is an emirp because it is prime and its reverse (12176819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91867121 - 2¹⁰ = 91866097 is a prime.

It is a Chen prime.

It is equal to p_5318963 and since 91867121 and 5318963 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91867141) 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, 45933560 + 45933561.

It is an arithmetic number, because the mean of its divisors is an integer number (45933561).

Almost surely, 2^91867121 is an apocalyptic number.

It is an amenable number.

91867121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91867121 is an equidigital number, since it uses as much as digits as its factorization.

91867121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 91867121 is about 9584.7337469541. The cubic root of 91867121 is about 451.2182970491.

The spelling of 91867121 in words is "ninety-one million, eight hundred sixty-seven thousand, one hundred twenty-one".