91164121 has 2 divisors, whose sum is σ = 91164122. Its totient is φ = 91164120.

The previous prime is 91164103. The next prime is 91164137. The reversal of 91164121 is 12146119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 17547721 = 8580^2 + 4189^2 .

It is a cyclic number.

It is not a de Polignac number, because 91164121 - 2⁹ = 91163609 is a prime.

It is not a weakly prime, because it can be changed into another prime (91165121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45582060 + 45582061.

It is an arithmetic number, because the mean of its divisors is an integer number (45582061).

Almost surely, 2^91164121 is an apocalyptic number.

It is an amenable number.

91164121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91164121 is an equidigital number, since it uses as much as digits as its factorization.

91164121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 25.

The square root of 91164121 is about 9547.9904168364. The cubic root of 91164121 is about 450.0643874946.

The spelling of 91164121 in words is "ninety-one million, one hundred sixty-four thousand, one hundred twenty-one".