4031861 has 2 divisors, whose sum is σ = 4031862. Its totient is φ = 4031860.

The previous prime is 4031849. The next prime is 4031879. The reversal of 4031861 is 1681304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3129361 + 902500 = 1769^2 + 950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4031861 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4031821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015930 + 2015931.

It is an arithmetic number, because the mean of its divisors is an integer number (2015931).

Almost surely, 2^4031861 is an apocalyptic number.

It is an amenable number.

4031861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4031861 is an equidigital number, since it uses as much as digits as its factorization.

4031861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 4031861 is about 2007.9494515550. The cubic root of 4031861 is about 159.1604592970.

The spelling of 4031861 in words is "four million, thirty-one thousand, eight hundred sixty-one".