71948309 has 2 divisors, whose sum is σ = 71948310. Its totient is φ = 71948308.

The previous prime is 71948299. The next prime is 71948311. The reversal of 71948309 is 90384917.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63520900 + 8427409 = 7970^2 + 2903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71948309 is a prime.

Together with 71948311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71948339) 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, 35974154 + 35974155.

It is an arithmetic number, because the mean of its divisors is an integer number (35974155).

Almost surely, 2^71948309 is an apocalyptic number.

It is an amenable number.

71948309 is a deficient number, since it is larger than the sum of its proper divisors (1).

71948309 is an equidigital number, since it uses as much as digits as its factorization.

71948309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 71948309 is about 8482.2349059667. The cubic root of 71948309 is about 415.9171837269.

The spelling of 71948309 in words is "seventy-one million, nine hundred forty-eight thousand, three hundred nine".