85491223 has 2 divisors, whose sum is σ = 85491224. Its totient is φ = 85491222.

The previous prime is 85491199. The next prime is 85491229. The reversal of 85491223 is 32219458.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85491223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85491229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42745611 + 42745612.

It is an arithmetic number, because the mean of its divisors is an integer number (42745612).

Almost surely, 2^85491223 is an apocalyptic number.

85491223 is a deficient number, since it is larger than the sum of its proper divisors (1).

85491223 is an equidigital number, since it uses as much as digits as its factorization.

85491223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 85491223 is about 9246.1463864683. The cubic root of 85491223 is about 440.5283305728.

The spelling of 85491223 in words is "eighty-five million, four hundred ninety-one thousand, two hundred twenty-three".