71123001919 has 4 divisors (see below), whose sum is σ = 71192663080. Its totient is φ = 71053340760.

The previous prime is 71123001889. The next prime is 71123001977. The reversal of 71123001919 is 91910032117.

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 71123001919 - 2⁷ = 71123001791 is a prime.

It is a super-2 number, since 2×71123001919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71123001979) 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, 34829049 + ... + 34831090.

It is an arithmetic number, because the mean of its divisors is an integer number (17798165770).

Almost surely, 2^71123001919 is an apocalyptic number.

71123001919 is a deficient number, since it is larger than the sum of its proper divisors (69661161).

71123001919 is a wasteful number, since it uses less digits than its factorization.

71123001919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69661160.

The product of its (nonzero) digits is 3402, while the sum is 34.

The spelling of 71123001919 in words is "seventy-one billion, one hundred twenty-three million, one thousand, nine hundred nineteen".