71918849 has 2 divisors, whose sum is σ = 71918850. Its totient is φ = 71918848.

The previous prime is 71918843. The next prime is 71918851. The reversal of 71918849 is 94881917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 21224449 = 7120^2 + 4607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71918849 is a prime.

Together with 71918851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71918843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35959424 + 35959425.

It is an arithmetic number, because the mean of its divisors is an integer number (35959425).

Almost surely, 2^71918849 is an apocalyptic number.

It is an amenable number.

71918849 is a deficient number, since it is larger than the sum of its proper divisors (1).

71918849 is an equidigital number, since it uses as much as digits as its factorization.

71918849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 47.

The square root of 71918849 is about 8480.4981575377. The cubic root of 71918849 is about 415.8604087396.

The spelling of 71918849 in words is "seventy-one million, nine hundred eighteen thousand, eight hundred forty-nine".