871617694631 has 2 divisors, whose sum is σ = 871617694632. Its totient is φ = 871617694630.

The previous prime is 871617694621. The next prime is 871617694643. The reversal of 871617694631 is 136496716178.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 871617694631 - 2¹⁸ = 871617432487 is a prime.

It is a super-2 number, since 2×871617694631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871617694621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435808847315 + 435808847316.

It is an arithmetic number, because the mean of its divisors is an integer number (435808847316).

Almost surely, 2^871617694631 is an apocalyptic number.

871617694631 is a deficient number, since it is larger than the sum of its proper divisors (1).

871617694631 is an equidigital number, since it uses as much as digits as its factorization.

871617694631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The spelling of 871617694631 in words is "eight hundred seventy-one billion, six hundred seventeen million, six hundred ninety-four thousand, six hundred thirty-one".