71117631 has 12 divisors (see below), whose sum is σ = 110627608. Its totient is φ = 43764624.

The previous prime is 71117623. The next prime is 71117639. The reversal of 71117631 is 13671117.

71117631 is a `hidden beast` number, since 7 + 11 + 17 + 631 = 666.

It is an interprime number because it is at equal distance from previous prime (71117623) and next prime (71117639).

It is not a de Polignac number, because 71117631 - 2³ = 71117623 is a prime.

It is a super-2 number, since 2×71117631² = 10115434878104322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71117595 and 71117604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71117639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303805 + ... + 304038.

Almost surely, 2^71117631 is an apocalyptic number.

71117631 is a deficient number, since it is larger than the sum of its proper divisors (39509977).

71117631 is a wasteful number, since it uses less digits than its factorization.

71117631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607862 (or 607859 counting only the distinct ones).

The product of its digits is 882, while the sum is 27.

The square root of 71117631 is about 8433.1270001109. The cubic root of 71117631 is about 414.3103288302.

Adding to 71117631 its reverse (13671117), we get a palindrome (84788748).

The spelling of 71117631 in words is "seventy-one million, one hundred seventeen thousand, six hundred thirty-one".