610891 has 2 divisors, whose sum is σ = 610892. Its totient is φ = 610890.

The previous prime is 610879. The next prime is 610913. The reversal of 610891 is 198016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 610891 - 2⁷ = 610763 is a prime.

It is not a weakly prime, because it can be changed into another prime (610801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305445 + 305446.

It is an arithmetic number, because the mean of its divisors is an integer number (305446).

2⁶¹⁰⁸⁹¹ is an apocalyptic number.

610891 is a deficient number, since it is larger than the sum of its proper divisors (1).

610891 is an equidigital number, since it uses as much as digits as its factorization.

610891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 610891 is about 781.5951637517. The cubic root of 610891 is about 84.8505331744.

The spelling of 610891 in words is "six hundred ten thousand, eight hundred ninety-one".