83391569 has 2 divisors, whose sum is σ = 83391570. Its totient is φ = 83391568.

The previous prime is 83391557. The next prime is 83391571. The reversal of 83391569 is 96519338.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52998400 + 30393169 = 7280^2 + 5513^2 .

It is a cyclic number.

It is not a de Polignac number, because 83391569 - 2²⁰ = 82342993 is a prime.

It is a super-2 number, since 2×83391569² = 13908307560563522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 83391571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83391509) 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, 41695784 + 41695785.

It is an arithmetic number, because the mean of its divisors is an integer number (41695785).

Almost surely, 2^83391569 is an apocalyptic number.

It is an amenable number.

83391569 is a deficient number, since it is larger than the sum of its proper divisors (1).

83391569 is an equidigital number, since it uses as much as digits as its factorization.

83391569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 83391569 is about 9131.8984335132. The cubic root of 83391569 is about 436.8919557576.

The spelling of 83391569 in words is "eighty-three million, three hundred ninety-one thousand, five hundred sixty-nine".