1831861 has 2 divisors, whose sum is σ = 1831862. Its totient is φ = 1831860.

The previous prime is 1831853. The next prime is 1831867. The reversal of 1831861 is 1681381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1562500 + 269361 = 1250^2 + 519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1831861 - 2³ = 1831853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1831867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915930 + 915931.

It is an arithmetic number, because the mean of its divisors is an integer number (915931).

2^1831861 is an apocalyptic number.

It is an amenable number.

1831861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831861 is an equidigital number, since it uses as much as digits as its factorization.

1831861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

The square root of 1831861 is about 1353.4625964540. The cubic root of 1831861 is about 122.3575687361.

The spelling of 1831861 in words is "one million, eight hundred thirty-one thousand, eight hundred sixty-one".