1921105969 has 4 divisors (see below), whose sum is σ = 1965782896. Its totient is φ = 1876429044.

The previous prime is 1921105913. The next prime is 1921105987. The reversal of 1921105969 is 9695011291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1921105969 - 2⁹ = 1921105457 is a prime.

It is a super-2 number, since 2×1921105969² = 7381296288254857922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 44676883 = 1921105969 / (1 + 9 + 2 + 1 + 1 + 0 + 5 + 9 + 6 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921105169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22338399 + ... + 22338484.

It is an arithmetic number, because the mean of its divisors is an integer number (491445724).

Almost surely, 2^1921105969 is an apocalyptic number.

It is an amenable number.

1921105969 is a deficient number, since it is larger than the sum of its proper divisors (44676927).

1921105969 is an equidigital number, since it uses as much as digits as its factorization.

1921105969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44676926.

The product of its (nonzero) digits is 43740, while the sum is 43.

The square root of 1921105969 is about 43830.4228704219. The cubic root of 1921105969 is about 1243.1316026038.

The spelling of 1921105969 in words is "one billion, nine hundred twenty-one million, one hundred five thousand, nine hundred sixty-nine".