91522213 has 2 divisors, whose sum is σ = 91522214. Its totient is φ = 91522212.

The previous prime is 91522181. The next prime is 91522219. The reversal of 91522213 is 31222519.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61732449 + 29789764 = 7857^2 + 5458^2 .

It is an emirp because it is prime and its reverse (31222519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91522213 - 2⁵ = 91522181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91522219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45761106 + 45761107.

It is an arithmetic number, because the mean of its divisors is an integer number (45761107).

Almost surely, 2^91522213 is an apocalyptic number.

It is an amenable number.

91522213 is a deficient number, since it is larger than the sum of its proper divisors (1).

91522213 is an equidigital number, since it uses as much as digits as its factorization.

91522213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 91522213 is about 9566.7242565049. The cubic root of 91522213 is about 450.6529008138.

The spelling of 91522213 in words is "ninety-one million, five hundred twenty-two thousand, two hundred thirteen".