71819121 has 8 divisors (see below), whose sum is σ = 104464224. Its totient is φ = 43526720.

The previous prime is 71819117. The next prime is 71819129. The reversal of 71819121 is 12191817.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71819121 - 2² = 71819117 is a prime.

It is a super-2 number, since 2×71819121² = 10315972282425282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71819129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088136 + ... + 1088201.

It is an arithmetic number, because the mean of its divisors is an integer number (13058028).

Almost surely, 2^71819121 is an apocalyptic number.

It is an amenable number.

71819121 is a deficient number, since it is larger than the sum of its proper divisors (32645103).

71819121 is a wasteful number, since it uses less digits than its factorization.

71819121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176351.

The product of its digits is 1008, while the sum is 30.

The square root of 71819121 is about 8474.6162744988. The cubic root of 71819121 is about 415.6680988792.

The spelling of 71819121 in words is "seventy-one million, eight hundred nineteen thousand, one hundred twenty-one".