91304891 has 2 divisors, whose sum is σ = 91304892. Its totient is φ = 91304890.

The previous prime is 91304881. The next prime is 91304903. The reversal of 91304891 is 19840319.

It is a weak prime.

It is an emirp because it is prime and its reverse (19840319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91304891 - 2¹⁸ = 91042747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91304821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45652445 + 45652446.

It is an arithmetic number, because the mean of its divisors is an integer number (45652446).

Almost surely, 2^91304891 is an apocalyptic number.

91304891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91304891 is an equidigital number, since it uses as much as digits as its factorization.

91304891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 91304891 is about 9555.3592815760. The cubic root of 91304891 is about 450.2959222298.

The spelling of 91304891 in words is "ninety-one million, three hundred four thousand, eight hundred ninety-one".