890861 has 2 divisors, whose sum is σ = 890862. Its totient is φ = 890860.

The previous prime is 890843. The next prime is 890863. The reversal of 890861 is 168098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 280900 = 781^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 890861 - 2⁶ = 890797 is a prime.

Together with 890863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445430 + 445431.

It is an arithmetic number, because the mean of its divisors is an integer number (445431).

2⁸⁹⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

890861 is a deficient number, since it is larger than the sum of its proper divisors (1).

890861 is an equidigital number, since it uses as much as digits as its factorization.

890861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 890861 is about 943.8543319814. The cubic root of 890861 is about 96.2210257421.

The spelling of 890861 in words is "eight hundred ninety thousand, eight hundred sixty-one".