71969399 has 2 divisors, whose sum is σ = 71969400. Its totient is φ = 71969398.

The previous prime is 71969371. The next prime is 71969423. The reversal of 71969399 is 99396917.

It is a strong prime.

It is an emirp because it is prime and its reverse (99396917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71969399 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71969399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71969099) 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, 35984699 + 35984700.

It is an arithmetic number, because the mean of its divisors is an integer number (35984700).

Almost surely, 2^71969399 is an apocalyptic number.

71969399 is a deficient number, since it is larger than the sum of its proper divisors (1).

71969399 is an equidigital number, since it uses as much as digits as its factorization.

71969399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 53.

The square root of 71969399 is about 8483.4780013860. The cubic root of 71969399 is about 415.9578186243.

The spelling of 71969399 in words is "seventy-one million, nine hundred sixty-nine thousand, three hundred ninety-nine".