71919899 has 4 divisors (see below), whose sum is σ = 71940264. Its totient is φ = 71899536.

The previous prime is 71919871. The next prime is 71919923. The reversal of 71919899 is 99891917.

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 71919899 - 2¹² = 71915803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71919899.

It is not an unprimeable number, because it can be changed into a prime (71919829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3362 + ... + 12455.

It is an arithmetic number, because the mean of its divisors is an integer number (17985066).

Almost surely, 2^71919899 is an apocalyptic number.

71919899 is a deficient number, since it is larger than the sum of its proper divisors (20365).

71919899 is a wasteful number, since it uses less digits than its factorization.

71919899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20364.

The product of its digits is 367416, while the sum is 53.

The square root of 71919899 is about 8480.5600640524. The cubic root of 71919899 is about 415.8624325545.

The spelling of 71919899 in words is "seventy-one million, nine hundred nineteen thousand, eight hundred ninety-nine".