91213127 has 2 divisors, whose sum is σ = 91213128. Its totient is φ = 91213126.

The previous prime is 91213123. The next prime is 91213139. The reversal of 91213127 is 72131219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91213127 - 2² = 91213123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91213096 and 91213105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91213123) 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, 45606563 + 45606564.

It is an arithmetic number, because the mean of its divisors is an integer number (45606564).

Almost surely, 2^91213127 is an apocalyptic number.

91213127 is a deficient number, since it is larger than the sum of its proper divisors (1).

91213127 is an equidigital number, since it uses as much as digits as its factorization.

91213127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 91213127 is about 9550.5563712278. The cubic root of 91213127 is about 450.1450182816.

The spelling of 91213127 in words is "ninety-one million, two hundred thirteen thousand, one hundred twenty-seven".