71216133 has 4 divisors (see below), whose sum is σ = 94954848. Its totient is φ = 47477420.

The previous prime is 71216129. The next prime is 71216147. The reversal of 71216133 is 33161217.

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 71216133 - 2² = 71216129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71216183) 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, 11869353 + ... + 11869358.

It is an arithmetic number, because the mean of its divisors is an integer number (23738712).

Almost surely, 2^71216133 is an apocalyptic number.

It is an amenable number.

71216133 is a deficient number, since it is larger than the sum of its proper divisors (23738715).

71216133 is a wasteful number, since it uses less digits than its factorization.

71216133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23738714.

The product of its digits is 756, while the sum is 24.

The square root of 71216133 is about 8438.9651616771. The cubic root of 71216133 is about 414.5015217798.

The spelling of 71216133 in words is "seventy-one million, two hundred sixteen thousand, one hundred thirty-three".