1861404841 has 2 divisors, whose sum is σ = 1861404842. Its totient is φ = 1861404840.

The previous prime is 1861404823. The next prime is 1861404859. The reversal of 1861404841 is 1484041681.

It is a balanced prime because it is at equal distance from previous prime (1861404823) and next prime (1861404859).

It can be written as a sum of positive squares in only one way, i.e., 1053651600 + 807753241 = 32460^2 + 28421^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861404841 - 2²¹ = 1859307689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1861404841.

It is not a weakly prime, because it can be changed into another prime (1861404541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930702420 + 930702421.

It is an arithmetic number, because the mean of its divisors is an integer number (930702421).

Almost surely, 2^1861404841 is an apocalyptic number.

It is an amenable number.

1861404841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861404841 is an equidigital number, since it uses as much as digits as its factorization.

1861404841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 1861404841 is about 43144.0012168552. The cubic root of 1861404841 is about 1230.1184896978.

The spelling of 1861404841 in words is "one billion, eight hundred sixty-one million, four hundred four thousand, eight hundred forty-one".