91497121 has 2 divisors, whose sum is σ = 91497122. Its totient is φ = 91497120.

The previous prime is 91497101. The next prime is 91497127. The reversal of 91497121 is 12179419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74390625 + 17106496 = 8625^2 + 4136^2 .

It is a cyclic number.

It is not a de Polignac number, because 91497121 - 2¹⁷ = 91366049 is a prime.

It is not a weakly prime, because it can be changed into another prime (91497127) 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, 45748560 + 45748561.

It is an arithmetic number, because the mean of its divisors is an integer number (45748561).

Almost surely, 2^91497121 is an apocalyptic number.

It is an amenable number.

91497121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91497121 is an equidigital number, since it uses as much as digits as its factorization.

91497121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 91497121 is about 9565.4127459300. The cubic root of 91497121 is about 450.6117129398.

The spelling of 91497121 in words is "ninety-one million, four hundred ninety-seven thousand, one hundred twenty-one".