85621559 has 2 divisors, whose sum is σ = 85621560. Its totient is φ = 85621558.

The previous prime is 85621517. The next prime is 85621561. The reversal of 85621559 is 95512658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85621559 is a prime.

Together with 85621561, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4977752 and since 85621559 and 4977752 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85621579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810779 + 42810780.

It is an arithmetic number, because the mean of its divisors is an integer number (42810780).

Almost surely, 2^85621559 is an apocalyptic number.

85621559 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621559 is an equidigital number, since it uses as much as digits as its factorization.

85621559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 41.

The square root of 85621559 is about 9253.1918276884. The cubic root of 85621559 is about 440.7520866688.

The spelling of 85621559 in words is "eighty-five million, six hundred twenty-one thousand, five hundred fifty-nine".