71216131 has 8 divisors (see below), whose sum is σ = 82137440. Its totient is φ = 60481728.

The previous prime is 71216129. The next prime is 71216147. The reversal of 71216131 is 13161217.

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 71216131 - 2¹ = 71216129 is a prime.

It is a super-2 number, since 2×71216131² = 10143474629218322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71214131) 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, 45906 + ... + 47431.

It is an arithmetic number, because the mean of its divisors is an integer number (10267180).

Almost surely, 2^71216131 is an apocalyptic number.

71216131 is a deficient number, since it is larger than the sum of its proper divisors (10921309).

71216131 is a wasteful number, since it uses less digits than its factorization.

71216131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93453.

The product of its digits is 252, while the sum is 22.

The square root of 71216131 is about 8438.9650431792. The cubic root of 71216131 is about 414.5015178996.

Adding to 71216131 its reverse (13161217), we get a palindrome (84377348).

The spelling of 71216131 in words is "seventy-one million, two hundred sixteen thousand, one hundred thirty-one".