71322631 has 4 divisors (see below), whose sum is σ = 71339632. Its totient is φ = 71305632.

The previous prime is 71322623. The next prime is 71322649. The reversal of 71322631 is 13622317.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 71322631 - 2³ = 71322623 is a prime.

It is a super-2 number, since 2×71322631² = 10173835385524322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71322596 and 71322605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71322131) 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, 2806 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (17834908).

Almost surely, 2^71322631 is an apocalyptic number.

71322631 is a deficient number, since it is larger than the sum of its proper divisors (17001).

71322631 is an equidigital number, since it uses as much as digits as its factorization.

71322631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000.

The product of its digits is 1512, while the sum is 25.

The square root of 71322631 is about 8445.2727013401. The cubic root of 71322631 is about 414.7080367696.

Adding to 71322631 its reverse (13622317), we get a palindrome (84944948).

The spelling of 71322631 in words is "seventy-one million, three hundred twenty-two thousand, six hundred thirty-one".