71843172889 has 4 divisors (see below), whose sum is σ = 72108277120. Its totient is φ = 71578068660.

The previous prime is 71843172859. The next prime is 71843172893. The reversal of 71843172889 is 98827134817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71843172889 - 2¹⁵ = 71843140121 is a prime.

It is a super-2 number, since 2×71843172889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71843172809) 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, 132551709 + ... + 132552250.

It is an arithmetic number, because the mean of its divisors is an integer number (18027069280).

Almost surely, 2^71843172889 is an apocalyptic number.

It is an amenable number.

71843172889 is a deficient number, since it is larger than the sum of its proper divisors (265104231).

71843172889 is a wasteful number, since it uses less digits than its factorization.

71843172889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265104230.

The product of its digits is 5419008, while the sum is 58.

The spelling of 71843172889 in words is "seventy-one billion, eight hundred forty-three million, one hundred seventy-two thousand, eight hundred eighty-nine".