71133971 has 4 divisors (see below), whose sum is σ = 71151792. Its totient is φ = 71116152.

The previous prime is 71133961. The next prime is 71133973. The reversal of 71133971 is 17933117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71133971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71133973) 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, 146 + ... + 11928.

It is an arithmetic number, because the mean of its divisors is an integer number (17787948).

Almost surely, 2^71133971 is an apocalyptic number.

71133971 is a deficient number, since it is larger than the sum of its proper divisors (17821).

71133971 is a wasteful number, since it uses less digits than its factorization.

71133971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17820.

The product of its digits is 3969, while the sum is 32.

The square root of 71133971 is about 8434.0957428761. The cubic root of 71133971 is about 414.3420570729.

The spelling of 71133971 in words is "seventy-one million, one hundred thirty-three thousand, nine hundred seventy-one".