85621583 has 2 divisors, whose sum is σ = 85621584. Its totient is φ = 85621582.

The previous prime is 85621579. The next prime is 85621621. The reversal of 85621583 is 38512658.

It is an a-pointer prime, because the next prime (85621621) can be obtained adding 85621583 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85621583 - 2² = 85621579 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85621183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42810791 + 42810792.

It is an arithmetic number, because the mean of its divisors is an integer number (42810792).

Almost surely, 2^85621583 is an apocalyptic number.

85621583 is a deficient number, since it is larger than the sum of its proper divisors (1).

85621583 is an equidigital number, since it uses as much as digits as its factorization.

85621583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 85621583 is about 9253.1931245381. The cubic root of 85621583 is about 440.7521278502.

The spelling of 85621583 in words is "eighty-five million, six hundred twenty-one thousand, five hundred eighty-three".