83391571 has 2 divisors, whose sum is σ = 83391572. Its totient is φ = 83391570.

The previous prime is 83391569. The next prime is 83391601. The reversal of 83391571 is 17519338.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83391571 - 2¹ = 83391569 is a prime.

It is a super-2 number, since 2×83391571² = 13908308227696082, which contains 22 as substring.

Together with 83391569, it forms a pair of twin primes.

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 83391571.

It is not a weakly prime, because it can be changed into another prime (83391071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41695785 + 41695786.

It is an arithmetic number, because the mean of its divisors is an integer number (41695786).

Almost surely, 2^83391571 is an apocalyptic number.

83391571 is a deficient number, since it is larger than the sum of its proper divisors (1).

83391571 is an equidigital number, since it uses as much as digits as its factorization.

83391571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 83391571 is about 9131.8985430194. The cubic root of 83391571 is about 436.8919592503.

It can be divided in two parts, 833915 and 71, that added together give a triangular number (833986 = T₁₂₉₁).

The spelling of 83391571 in words is "eighty-three million, three hundred ninety-one thousand, five hundred seventy-one".