85487489 has 2 divisors, whose sum is σ = 85487490. Its totient is φ = 85487488.

The previous prime is 85487477. The next prime is 85487531. The reversal of 85487489 is 98478458.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 16265089 = 8320^2 + 4033^2 .

It is a cyclic number.

It is not a de Polignac number, because 85487489 - 2¹² = 85483393 is a prime.

It is a super-2 number, since 2×85487489² = 14616221551050242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85487489.

It is not a weakly prime, because it can be changed into another prime (85487089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42743744 + 42743745.

It is an arithmetic number, because the mean of its divisors is an integer number (42743745).

Almost surely, 2^85487489 is an apocalyptic number.

It is an amenable number.

85487489 is a deficient number, since it is larger than the sum of its proper divisors (1).

85487489 is an equidigital number, since it uses as much as digits as its factorization.

85487489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 53.

The square root of 85487489 is about 9245.9444623035. The cubic root of 85487489 is about 440.5219168278.

The spelling of 85487489 in words is "eighty-five million, four hundred eighty-seven thousand, four hundred eighty-nine".