861613 has 2 divisors, whose sum is σ = 861614. Its totient is φ = 861612.

The previous prime is 861599. The next prime is 861617. The reversal of 861613 is 316168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 316969 = 738^2 + 563^2 .

861613 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430806 + 430807.

It is an arithmetic number, because the mean of its divisors is an integer number (430807).

2⁸⁶¹⁶¹³ is an apocalyptic number.

It is an amenable number.

861613 is a deficient number, since it is larger than the sum of its proper divisors (1).

861613 is an equidigital number, since it uses as much as digits as its factorization.

861613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 861613 is about 928.2311134626. The cubic root of 861613 is about 95.1562709625.

The spelling of 861613 in words is "eight hundred sixty-one thousand, six hundred thirteen".