871617694621 has 2 divisors, whose sum is σ = 871617694622. Its totient is φ = 871617694620.

The previous prime is 871617694603. The next prime is 871617694631. The reversal of 871617694621 is 126496716178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 842586305625 + 29031388996 = 917925^2 + 170386^2 .

It is a cyclic number.

It is not a de Polignac number, because 871617694621 - 2³³ = 863027760029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871617694631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435808847310 + 435808847311.

It is an arithmetic number, because the mean of its divisors is an integer number (435808847311).

Almost surely, 2^871617694621 is an apocalyptic number.

It is an amenable number.

871617694621 is a deficient number, since it is larger than the sum of its proper divisors (1).

871617694621 is an equidigital number, since it uses as much as digits as its factorization.

871617694621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 58.

The spelling of 871617694621 in words is "eight hundred seventy-one billion, six hundred seventeen million, six hundred ninety-four thousand, six hundred twenty-one".