71969999 has 4 divisors (see below), whose sum is σ = 72003936. Its totient is φ = 71936064.

The previous prime is 71969987. The next prime is 71970007. The reversal of 71969999 is 99996917.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71969999 - 2¹² = 71965903 is a prime.

It is a Duffinian number.

71969999 is a modest number, since divided by 9999 gives 7196 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71969969) 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 in 3 ways as a sum of consecutive naturals, for example, 13559 + ... + 18104.

It is an arithmetic number, because the mean of its divisors is an integer number (18000984).

Almost surely, 2^71969999 is an apocalyptic number.

71969999 is a deficient number, since it is larger than the sum of its proper divisors (33937).

71969999 is a wasteful number, since it uses less digits than its factorization.

71969999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33936.

The product of its digits is 2480058, while the sum is 59.

The square root of 71969999 is about 8483.5133641670. The cubic root of 71969999 is about 415.9589745508.

The spelling of 71969999 in words is "seventy-one million, nine hundred sixty-nine thousand, nine hundred ninety-nine".