71971019 has 2 divisors, whose sum is σ = 71971020. Its totient is φ = 71971018.

The previous prime is 71970989. The next prime is 71971021. The reversal of 71971019 is 91017917.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71971019 - 2⁸ = 71970763 is a prime.

It is a super-2 number, since 2×71971019² = 10359655151796722, which contains 22 as substring.

Together with 71971021, 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 71971019.

It is not a weakly prime, because it can be changed into another prime (71971819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35985509 + 35985510.

It is an arithmetic number, because the mean of its divisors is an integer number (35985510).

Almost surely, 2^71971019 is an apocalyptic number.

71971019 is a deficient number, since it is larger than the sum of its proper divisors (1).

71971019 is an equidigital number, since it uses as much as digits as its factorization.

71971019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3969, while the sum is 35.

The square root of 71971019 is about 8483.5734805564. The cubic root of 71971019 is about 415.9609396110.

The spelling of 71971019 in words is "seventy-one million, nine hundred seventy-one thousand, nineteen".