1921946443 has 2 divisors, whose sum is σ = 1921946444. Its totient is φ = 1921946442.

The previous prime is 1921946437. The next prime is 1921946479. The reversal of 1921946443 is 3446491291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1921946443 - 2¹³ = 1921938251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921946443.

It is not a weakly prime, because it can be changed into another prime (1921946483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960973221 + 960973222.

It is an arithmetic number, because the mean of its divisors is an integer number (960973222).

Almost surely, 2^1921946443 is an apocalyptic number.

1921946443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921946443 is an equidigital number, since it uses as much as digits as its factorization.

1921946443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 1921946443 is about 43840.0096145062. The cubic root of 1921946443 is about 1243.3128640710.

The spelling of 1921946443 in words is "one billion, nine hundred twenty-one million, nine hundred forty-six thousand, four hundred forty-three".