85947289 has 2 divisors, whose sum is σ = 85947290. Its totient is φ = 85947288.

The previous prime is 85947287. The next prime is 85947293. The reversal of 85947289 is 98274958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62015625 + 23931664 = 7875^2 + 4892^2 .

It is a cyclic number.

It is not a de Polignac number, because 85947289 - 2¹ = 85947287 is a prime.

Together with 85947287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85947287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42973644 + 42973645.

It is an arithmetic number, because the mean of its divisors is an integer number (42973645).

Almost surely, 2^85947289 is an apocalyptic number.

It is an amenable number.

85947289 is a deficient number, since it is larger than the sum of its proper divisors (1).

85947289 is an equidigital number, since it uses as much as digits as its factorization.

85947289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 85947289 is about 9270.7760732314. The cubic root of 85947289 is about 441.3102969547.

The spelling of 85947289 in words is "eighty-five million, nine hundred forty-seven thousand, two hundred eighty-nine".