85813691 has 2 divisors, whose sum is σ = 85813692. Its totient is φ = 85813690.

The previous prime is 85813661. The next prime is 85813703. The reversal of 85813691 is 19631858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85813691 - 2⁶ = 85813627 is a prime.

It is not a weakly prime, because it can be changed into another prime (85813601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42906845 + 42906846.

It is an arithmetic number, because the mean of its divisors is an integer number (42906846).

Almost surely, 2^85813691 is an apocalyptic number.

85813691 is a deficient number, since it is larger than the sum of its proper divisors (1).

85813691 is an equidigital number, since it uses as much as digits as its factorization.

85813691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 85813691 is about 9263.5679411337. The cubic root of 85813691 is about 441.0815181737.

The spelling of 85813691 in words is "eighty-five million, eight hundred thirteen thousand, six hundred ninety-one".