71680919 has 2 divisors, whose sum is σ = 71680920. Its totient is φ = 71680918.

The previous prime is 71680883. The next prime is 71680927. The reversal of 71680919 is 91908617.

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-71680919 is a prime.

It is a super-2 number, since 2×71680919² = 10276308297369122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71680979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35840459 + 35840460.

It is an arithmetic number, because the mean of its divisors is an integer number (35840460).

Almost surely, 2^71680919 is an apocalyptic number.

71680919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71680919 is an equidigital number, since it uses as much as digits as its factorization.

71680919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 71680919 is about 8466.4584685688. The cubic root of 71680919 is about 415.4013034017.

The spelling of 71680919 in words is "seventy-one million, six hundred eighty thousand, nine hundred nineteen".