83431889 has 2 divisors, whose sum is σ = 83431890. Its totient is φ = 83431888.

The previous prime is 83431877. The next prime is 83431891. The reversal of 83431889 is 98813438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65934400 + 17497489 = 8120^2 + 4183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83431889 is a prime.

Together with 83431891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83431589) 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 as a sum of consecutive naturals, namely, 41715944 + 41715945.

It is an arithmetic number, because the mean of its divisors is an integer number (41715945).

Almost surely, 2^83431889 is an apocalyptic number.

It is an amenable number.

83431889 is a deficient number, since it is larger than the sum of its proper divisors (1).

83431889 is an equidigital number, since it uses as much as digits as its factorization.

83431889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 83431889 is about 9134.1058128314. The cubic root of 83431889 is about 436.9623571407.

It can be divided in two parts, 834 and 31889, that added together give a palindrome (32723).

The spelling of 83431889 in words is "eighty-three million, four hundred thirty-one thousand, eight hundred eighty-nine".