85838989 has 2 divisors, whose sum is σ = 85838990. Its totient is φ = 85838988.

The previous prime is 85838983. The next prime is 85839023. The reversal of 85838989 is 98983858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80245764 + 5593225 = 8958^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 85838989 - 2⁵ = 85838957 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85838983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42919494 + 42919495.

It is an arithmetic number, because the mean of its divisors is an integer number (42919495).

Almost surely, 2^85838989 is an apocalyptic number.

It is an amenable number.

85838989 is a deficient number, since it is larger than the sum of its proper divisors (1).

85838989 is an equidigital number, since it uses as much as digits as its factorization.

85838989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 58.

The square root of 85838989 is about 9264.9332971155. The cubic root of 85838989 is about 441.1248577380.

The spelling of 85838989 in words is "eighty-five million, eight hundred thirty-eight thousand, nine hundred eighty-nine".