71291971 has 8 divisors (see below), whose sum is σ = 77465600. Its totient is φ = 65360520.

The previous prime is 71291963. The next prime is 71292017. The reversal of 71291971 is 17919217.

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 71291971 - 2³ = 71291963 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 71291971.

It is not an unprimeable number, because it can be changed into a prime (71291911) 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, 59931 + ... + 61108.

It is an arithmetic number, because the mean of its divisors is an integer number (9683200).

Almost surely, 2^71291971 is an apocalyptic number.

71291971 is a deficient number, since it is larger than the sum of its proper divisors (6173629).

71291971 is a wasteful number, since it uses less digits than its factorization.

71291971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121089.

The product of its digits is 7938, while the sum is 37.

The square root of 71291971 is about 8443.4572895231. The cubic root of 71291971 is about 414.6486036901.

The spelling of 71291971 in words is "seventy-one million, two hundred ninety-one thousand, nine hundred seventy-one".