91324643 has 2 divisors, whose sum is σ = 91324644. Its totient is φ = 91324642.

The previous prime is 91324631. The next prime is 91324657. The reversal of 91324643 is 34642319.

It is a weak prime.

It is an emirp because it is prime and its reverse (34642319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91324643 - 2⁶ = 91324579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91324603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45662321 + 45662322.

It is an arithmetic number, because the mean of its divisors is an integer number (45662322).

Almost surely, 2^91324643 is an apocalyptic number.

91324643 is a deficient number, since it is larger than the sum of its proper divisors (1).

91324643 is an equidigital number, since it uses as much as digits as its factorization.

91324643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 91324643 is about 9556.3927817980. The cubic root of 91324643 is about 450.3283907489.

The spelling of 91324643 in words is "ninety-one million, three hundred twenty-four thousand, six hundred forty-three".