91227121 has 2 divisors, whose sum is σ = 91227122. Its totient is φ = 91227120.

The previous prime is 91227061. The next prime is 91227161. The reversal of 91227121 is 12172219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 42771600 = 6961^2 + 6540^2 .

It is an emirp because it is prime and its reverse (12172219) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91227121 - 2⁹ = 91226609 is a prime.

It is not a weakly prime, because it can be changed into another prime (91227161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45613560 + 45613561.

It is an arithmetic number, because the mean of its divisors is an integer number (45613561).

Almost surely, 2^91227121 is an apocalyptic number.

It is an amenable number.

91227121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91227121 is an equidigital number, since it uses as much as digits as its factorization.

91227121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 91227121 is about 9551.2889706050. The cubic root of 91227121 is about 450.1680376556.

The spelling of 91227121 in words is "ninety-one million, two hundred twenty-seven thousand, one hundred twenty-one".