71216069 has 4 divisors (see below), whose sum is σ = 71589120. Its totient is φ = 70843020.

The previous prime is 71216063. The next prime is 71216071. The reversal of 71216069 is 96061217.

It is a happy number.

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 71216069 - 2⁸ = 71215813 is a prime.

It is a super-2 number, since 2×71216069² = 10143456967625522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71216063) 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, 186239 + ... + 186620.

It is an arithmetic number, because the mean of its divisors is an integer number (17897280).

Almost surely, 2^71216069 is an apocalyptic number.

It is an amenable number.

71216069 is a deficient number, since it is larger than the sum of its proper divisors (373051).

71216069 is a wasteful number, since it uses less digits than its factorization.

71216069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373050.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 71216069 is about 8438.9613697421. The cubic root of 71216069 is about 414.5013976127.

The spelling of 71216069 in words is "seventy-one million, two hundred sixteen thousand, sixty-nine".