613861 has 2 divisors, whose sum is σ = 613862. Its totient is φ = 613860.

The previous prime is 613849. The next prime is 613883. The reversal of 613861 is 168316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 22500 = 769^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 613861 - 2⁵ = 613829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306930 + 306931.

It is an arithmetic number, because the mean of its divisors is an integer number (306931).

2⁶¹³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

613861 is a deficient number, since it is larger than the sum of its proper divisors (1).

613861 is an equidigital number, since it uses as much as digits as its factorization.

613861 is an evil number, because the sum of its binary digits is even.

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

The square root of 613861 is about 783.4928206436. The cubic root of 613861 is about 84.9878183235.

The spelling of 613861 in words is "six hundred thirteen thousand, eight hundred sixty-one".