1921462681 has 2 divisors, whose sum is σ = 1921462682. Its totient is φ = 1921462680.

The previous prime is 1921462679. The next prime is 1921462687. The reversal of 1921462681 is 1862641291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1620787081 + 300675600 = 40259^2 + 17340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921462681 - 2¹ = 1921462679 is a prime.

It is a super-2 number, since 2×1921462681² = 7384037668951415522, which contains 22 as substring.

Together with 1921462679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1921462687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960731340 + 960731341.

It is an arithmetic number, because the mean of its divisors is an integer number (960731341).

Almost surely, 2^1921462681 is an apocalyptic number.

It is an amenable number.

1921462681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921462681 is an equidigital number, since it uses as much as digits as its factorization.

1921462681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 1921462681 is about 43834.4919099104. The cubic root of 1921462681 is about 1243.2085396259.

The spelling of 1921462681 in words is "one billion, nine hundred twenty-one million, four hundred sixty-two thousand, six hundred eighty-one".