71983139 has 2 divisors, whose sum is σ = 71983140. Its totient is φ = 71983138.

The previous prime is 71983129. The next prime is 71983181. The reversal of 71983139 is 93138917.

It is a weak prime.

It is an emirp because it is prime and its reverse (93138917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71983139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71983096 and 71983105.

It is not a weakly prime, because it can be changed into another prime (71983129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35991569 + 35991570.

It is an arithmetic number, because the mean of its divisors is an integer number (35991570).

Almost surely, 2^71983139 is an apocalyptic number.

71983139 is a deficient number, since it is larger than the sum of its proper divisors (1).

71983139 is an equidigital number, since it uses as much as digits as its factorization.

71983139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 71983139 is about 8484.2877721115. The cubic root of 71983139 is about 415.9842877294.

The spelling of 71983139 in words is "seventy-one million, nine hundred eighty-three thousand, one hundred thirty-nine".