2831861 has 2 divisors, whose sum is σ = 2831862. Its totient is φ = 2831860.

The previous prime is 2831849. The next prime is 2831863. The reversal of 2831861 is 1681382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1768900 + 1062961 = 1330^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 2831861 - 2¹⁰ = 2830837 is a prime.

Together with 2831863, 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 (2831863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1415930 + 1415931.

It is an arithmetic number, because the mean of its divisors is an integer number (1415931).

2^2831861 is an apocalyptic number.

It is an amenable number.

2831861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2831861 is an equidigital number, since it uses as much as digits as its factorization.

2831861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 2831861 is about 1682.8134180592. The cubic root of 2831861 is about 141.4785643465.

The spelling of 2831861 in words is "two million, eight hundred thirty-one thousand, eight hundred sixty-one".