613813 has 2 divisors, whose sum is σ = 613814. Its totient is φ = 613812.

The previous prime is 613807. The next prime is 613817. The reversal of 613813 is 318316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 69169 = 738^2 + 263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306906 + 306907.

It is an arithmetic number, because the mean of its divisors is an integer number (306907).

2⁶¹³⁸¹³ is an apocalyptic number.

It is an amenable number.

613813 is a deficient number, since it is larger than the sum of its proper divisors (1).

613813 is an equidigital number, since it uses as much as digits as its factorization.

613813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 613813 is about 783.4621879836. The cubic root of 613813 is about 84.9856030980.

The spelling of 613813 in words is "six hundred thirteen thousand, eight hundred thirteen".