1870819681 has 2 divisors, whose sum is σ = 1870819682. Its totient is φ = 1870819680.

The previous prime is 1870819679. The next prime is 1870819703. The reversal of 1870819681 is 1869180781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1674119056 + 196700625 = 40916^2 + 14025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1870819681 - 2¹ = 1870819679 is a prime.

It is a super-2 number, since 2×1870819681² = 6999932557633883522, which contains 22 as substring.

Together with 1870819679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1870819481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935409840 + 935409841.

It is an arithmetic number, because the mean of its divisors is an integer number (935409841).

Almost surely, 2^1870819681 is an apocalyptic number.

It is an amenable number.

1870819681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1870819681 is an equidigital number, since it uses as much as digits as its factorization.

1870819681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 49.

The square root of 1870819681 is about 43252.9730885635. The cubic root of 1870819681 is about 1232.1889505497.

The spelling of 1870819681 in words is "one billion, eight hundred seventy million, eight hundred nineteen thousand, six hundred eighty-one".