91256197 has 2 divisors, whose sum is σ = 91256198. Its totient is φ = 91256196.

The previous prime is 91256167. The next prime is 91256213. The reversal of 91256197 is 79165219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91221601 + 34596 = 9551^2 + 186^2 .

It is a cyclic number.

It is not a de Polignac number, because 91256197 - 2¹⁹ = 90731909 is a prime.

It is a super-3 number, since 3×91256197³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91256117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45628098 + 45628099.

It is an arithmetic number, because the mean of its divisors is an integer number (45628099).

Almost surely, 2^91256197 is an apocalyptic number.

It is an amenable number.

91256197 is a deficient number, since it is larger than the sum of its proper divisors (1).

91256197 is an equidigital number, since it uses as much as digits as its factorization.

91256197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 40.

The square root of 91256197 is about 9552.8109475693. The cubic root of 91256197 is about 450.2158585791.

The spelling of 91256197 in words is "ninety-one million, two hundred fifty-six thousand, one hundred ninety-seven".