91671793 has 2 divisors, whose sum is σ = 91671794. Its totient is φ = 91671792.

The previous prime is 91671773. The next prime is 91671799. The reversal of 91671793 is 39717619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72029169 + 19642624 = 8487^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 91671793 - 2¹³ = 91663601 is a prime.

It is not a weakly prime, because it can be changed into another prime (91671799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45835896 + 45835897.

It is an arithmetic number, because the mean of its divisors is an integer number (45835897).

Almost surely, 2^91671793 is an apocalyptic number.

It is an amenable number.

91671793 is a deficient number, since it is larger than the sum of its proper divisors (1).

91671793 is an equidigital number, since it uses as much as digits as its factorization.

91671793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 43.

The square root of 91671793 is about 9574.5387878477. The cubic root of 91671793 is about 450.8982764763.

The spelling of 91671793 in words is "ninety-one million, six hundred seventy-one thousand, seven hundred ninety-three".