613381 has 2 divisors, whose sum is σ = 613382. Its totient is φ = 613380.

The previous prime is 613367. The next prime is 613421. The reversal of 613381 is 183316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410881 + 202500 = 641^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 613381 - 2⁷ = 613253 is a prime.

It is a super-2 number, since 2×613381² = 752472502322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (613181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306690 + 306691.

It is an arithmetic number, because the mean of its divisors is an integer number (306691).

2⁶¹³³⁸¹ is an apocalyptic number.

It is an amenable number.

613381 is a deficient number, since it is larger than the sum of its proper divisors (1).

613381 is an equidigital number, since it uses as much as digits as its factorization.

613381 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 613381 is about 783.1864401278. The cubic root of 613381 is about 84.9656608697.

Adding to 613381 its reverse (183316), we get a palindrome (796697).

The spelling of 613381 in words is "six hundred thirteen thousand, three hundred eighty-one".