1912681 has 2 divisors, whose sum is σ = 1912682. Its totient is φ = 1912680.

The previous prime is 1912679. The next prime is 1912693. The reversal of 1912681 is 1862191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 8281 = 1380^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912681 - 2¹ = 1912679 is a prime.

It is a super-2 number, since 2×1912681² = 7316697215522, which contains 22 as substring.

Together with 1912679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1912601) 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, 956340 + 956341.

It is an arithmetic number, because the mean of its divisors is an integer number (956341).

2^1912681 is an apocalyptic number.

It is an amenable number.

1912681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912681 is an equidigital number, since it uses as much as digits as its factorization.

1912681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 1912681 is about 1382.9971077338. The cubic root of 1912681 is about 124.1311697298.

The spelling of 1912681 in words is "one million, nine hundred twelve thousand, six hundred eighty-one".