85929791 has 2 divisors, whose sum is σ = 85929792. Its totient is φ = 85929790.

The previous prime is 85929787. The next prime is 85929793. The reversal of 85929791 is 19792958.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85929791 - 2² = 85929787 is a prime.

Together with 85929793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85929793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42964895 + 42964896.

It is an arithmetic number, because the mean of its divisors is an integer number (42964896).

Almost surely, 2^85929791 is an apocalyptic number.

85929791 is a deficient number, since it is larger than the sum of its proper divisors (1).

85929791 is an equidigital number, since it uses as much as digits as its factorization.

85929791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 85929791 is about 9269.8323070053. The cubic root of 85929791 is about 441.2803461489.

The spelling of 85929791 in words is "eighty-five million, nine hundred twenty-nine thousand, seven hundred ninety-one".