85489997 has 4 divisors (see below), whose sum is σ = 86939040. Its totient is φ = 84040956.

The previous prime is 85489981. The next prime is 85490021. The reversal of 85489997 is 79998458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79998458 = 2 ⋅39999229.

It is a cyclic number.

It is not a de Polignac number, because 85489997 - 2⁴ = 85489981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 1448983 = 85489997 / (8 + 5 + 4 + 8 + 9 + 9 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85489907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724433 + ... + 724550.

It is an arithmetic number, because the mean of its divisors is an integer number (21734760).

Almost surely, 2^85489997 is an apocalyptic number.

It is an amenable number.

85489997 is a deficient number, since it is larger than the sum of its proper divisors (1449043).

85489997 is a wasteful number, since it uses less digits than its factorization.

85489997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449042.

The product of its digits is 6531840, while the sum is 59.

The square root of 85489997 is about 9246.0800883401. The cubic root of 85489997 is about 440.5262247414.

The spelling of 85489997 in words is "eighty-five million, four hundred eighty-nine thousand, nine hundred ninety-seven".