871177661 has 16 divisors (see below), whose sum is σ = 925617840. Its totient is φ = 818657280.

The previous prime is 871177651. The next prime is 871177667. The reversal of 871177661 is 166771178.

It can be written as a sum of positive squares in 8 ways, for example, as 42436 + 871135225 = 206^2 + 29515^2 .

It is a cyclic number.

It is not a de Polignac number, because 871177661 - 2¹⁰ = 871176637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871177667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169055 + ... + 174131.

It is an arithmetic number, because the mean of its divisors is an integer number (57851115).

Almost surely, 2^871177661 is an apocalyptic number.

It is an amenable number.

871177661 is a deficient number, since it is larger than the sum of its proper divisors (54440179).

871177661 is a wasteful number, since it uses less digits than its factorization.

871177661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264.

The product of its digits is 98784, while the sum is 44.

The square root of 871177661 is about 29515.7188799460. The cubic root of 871177661 is about 955.0708210228.

The spelling of 871177661 in words is "eight hundred seventy-one million, one hundred seventy-seven thousand, six hundred sixty-one".