85891523 has 2 divisors, whose sum is σ = 85891524. Its totient is φ = 85891522.

The previous prime is 85891517. The next prime is 85891537. The reversal of 85891523 is 32519858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85891523 - 2⁶ = 85891459 is a prime.

It is not a weakly prime, because it can be changed into another prime (85891583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42945761 + 42945762.

It is an arithmetic number, because the mean of its divisors is an integer number (42945762).

Almost surely, 2^85891523 is an apocalyptic number.

85891523 is a deficient number, since it is larger than the sum of its proper divisors (1).

85891523 is an equidigital number, since it uses as much as digits as its factorization.

85891523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 41.

The square root of 85891523 is about 9267.7679621363. The cubic root of 85891523 is about 441.2148297798.

The spelling of 85891523 in words is "eighty-five million, eight hundred ninety-one thousand, five hundred twenty-three".