611921 has 2 divisors, whose sum is σ = 611922. Its totient is φ = 611920.

The previous prime is 611903. The next prime is 611927. The reversal of 611921 is 129116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 70225 = 736^2 + 265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 611893 and 611902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 611921.

It is not a weakly prime, because it can be changed into another prime (611927) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305960 + 305961.

It is an arithmetic number, because the mean of its divisors is an integer number (305961).

2⁶¹¹⁹²¹ is an apocalyptic number.

It is an amenable number.

611921 is a deficient number, since it is larger than the sum of its proper divisors (1).

611921 is an equidigital number, since it uses as much as digits as its factorization.

611921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 20.

The square root of 611921 is about 782.2537951330. The cubic root of 611921 is about 84.8981941465.

The spelling of 611921 in words is "six hundred eleven thousand, nine hundred twenty-one".