71940019 has 2 divisors, whose sum is σ = 71940020. Its totient is φ = 71940018.

The previous prime is 71940017. The next prime is 71940047. The reversal of 71940019 is 91004917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71940019 - 2¹ = 71940017 is a prime.

It is a super-3 number, since 3×71940019³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 71940017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71940013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35970009 + 35970010.

It is an arithmetic number, because the mean of its divisors is an integer number (35970010).

Almost surely, 2^71940019 is an apocalyptic number.

71940019 is a deficient number, since it is larger than the sum of its proper divisors (1).

71940019 is an equidigital number, since it uses as much as digits as its factorization.

71940019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 71940019 is about 8481.7462235085. The cubic root of 71940019 is about 415.9012088975.

The spelling of 71940019 in words is "seventy-one million, nine hundred forty thousand, nineteen".