83581079 has 2 divisors, whose sum is σ = 83581080. Its totient is φ = 83581078.

The previous prime is 83581051. The next prime is 83581081. The reversal of 83581079 is 97018538.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83581079 is a prime.

Together with 83581081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83581049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41790539 + 41790540.

It is an arithmetic number, because the mean of its divisors is an integer number (41790540).

Almost surely, 2^83581079 is an apocalyptic number.

83581079 is a deficient number, since it is larger than the sum of its proper divisors (1).

83581079 is an equidigital number, since it uses as much as digits as its factorization.

83581079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 83581079 is about 9142.2688103118. The cubic root of 83581079 is about 437.2226556761. Note that the first 3 decimals are identical.

The spelling of 83581079 in words is "eighty-three million, five hundred eighty-one thousand, seventy-nine".