71497919 has 2 divisors, whose sum is σ = 71497920. Its totient is φ = 71497918.

The previous prime is 71497913. The next prime is 71497981. The reversal of 71497919 is 91979417.

It is a weak prime.

It is an emirp because it is prime and its reverse (91979417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71497919 - 2⁸ = 71497663 is a prime.

It is a super-2 number, since 2×71497919² = 10223904842661122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71497913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35748959 + 35748960.

It is an arithmetic number, because the mean of its divisors is an integer number (35748960).

Almost surely, 2^71497919 is an apocalyptic number.

71497919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71497919 is an equidigital number, since it uses as much as digits as its factorization.

71497919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 47.

The square root of 71497919 is about 8455.6442096389. The cubic root of 71497919 is about 415.0474983134.

The spelling of 71497919 in words is "seventy-one million, four hundred ninety-seven thousand, nine hundred nineteen".