616261 has 2 divisors, whose sum is σ = 616262. Its totient is φ = 616260.

The previous prime is 616243. The next prime is 616277. The reversal of 616261 is 162616.

616261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 36 = 785^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 616261 - 2⁵ = 616229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308130 + 308131.

It is an arithmetic number, because the mean of its divisors is an integer number (308131).

2⁶¹⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

616261 is a deficient number, since it is larger than the sum of its proper divisors (1).

616261 is an equidigital number, since it uses as much as digits as its factorization.

616261 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 616261 is about 785.0229296014. The cubic root of 616261 is about 85.0984326807.

Adding to 616261 its reverse (162616), we get a palindrome (778877).

The spelling of 616261 in words is "six hundred sixteen thousand, two hundred sixty-one".