91213349 has 2 divisors, whose sum is σ = 91213350. Its totient is φ = 91213348.

The previous prime is 91213289. The next prime is 91213379. The reversal of 91213349 is 94331219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 5373124 = 9265^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 91213349 - 2¹⁶ = 91147813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91213379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45606674 + 45606675.

It is an arithmetic number, because the mean of its divisors is an integer number (45606675).

Almost surely, 2^91213349 is an apocalyptic number.

It is an amenable number.

91213349 is a deficient number, since it is larger than the sum of its proper divisors (1).

91213349 is an equidigital number, since it uses as much as digits as its factorization.

91213349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 91213349 is about 9550.5679935803. The cubic root of 91213349 is about 450.1453834779.

The spelling of 91213349 in words is "ninety-one million, two hundred thirteen thousand, three hundred forty-nine".