871613 has 2 divisors, whose sum is σ = 871614. Its totient is φ = 871612.

The previous prime is 871597. The next prime is 871621. The reversal of 871613 is 316178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582169 + 289444 = 763^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 871613 - 2⁴ = 871597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435806 + 435807.

It is an arithmetic number, because the mean of its divisors is an integer number (435807).

2⁸⁷¹⁶¹³ is an apocalyptic number.

It is an amenable number.

871613 is a deficient number, since it is larger than the sum of its proper divisors (1).

871613 is an equidigital number, since it uses as much as digits as its factorization.

871613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 871613 is about 933.6021636650. The cubic root of 871613 is about 95.5229881705.

The spelling of 871613 in words is "eight hundred seventy-one thousand, six hundred thirteen".