1885813681 has 2 divisors, whose sum is σ = 1885813682. Its totient is φ = 1885813680.

The previous prime is 1885813649. The next prime is 1885813697. The reversal of 1885813681 is 1863185881.

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., 1491195456 + 394618225 = 38616^2 + 19865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1885813681 - 2⁵ = 1885813649 is a prime.

It is a super-3 number, since 3×1885813681³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1885813781) 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, 942906840 + 942906841.

It is an arithmetic number, because the mean of its divisors is an integer number (942906841).

Almost surely, 2^1885813681 is an apocalyptic number.

It is an amenable number.

1885813681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1885813681 is an equidigital number, since it uses as much as digits as its factorization.

1885813681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 368640, while the sum is 49.

The square root of 1885813681 is about 43425.9563049566. The cubic root of 1885813681 is about 1235.4720571894.

The spelling of 1885813681 in words is "one billion, eight hundred eighty-five million, eight hundred thirteen thousand, six hundred eighty-one".