1641863 has 2 divisors, whose sum is σ = 1641864. Its totient is φ = 1641862.

The previous prime is 1641841. The next prime is 1641881. The reversal of 1641863 is 3681461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1641863 - 2⁶ = 1641799 is a prime.

It is a super-2 number, since 2×1641863² = 5391428221538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820931 + 820932.

It is an arithmetic number, because the mean of its divisors is an integer number (820932).

2^1641863 is an apocalyptic number.

1641863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641863 is an equidigital number, since it uses as much as digits as its factorization.

1641863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 1641863 is about 1281.3520203285. The cubic root of 1641863 is about 117.9720081070.

The spelling of 1641863 in words is "one million, six hundred forty-one thousand, eight hundred sixty-three".