1881923969 has 2 divisors, whose sum is σ = 1881923970. Its totient is φ = 1881923968.

The previous prime is 1881923909. The next prime is 1881923971. The reversal of 1881923969 is 9693291881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1171008400 + 710915569 = 34220^2 + 26663^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881923969 - 2⁸ = 1881923713 is a prime.

It is a super-2 number, since 2×1881923969² = 7083275650193425922, which contains 22 as substring.

Together with 1881923971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1881923909) 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, 940961984 + 940961985.

It is an arithmetic number, because the mean of its divisors is an integer number (940961985).

Almost surely, 2^1881923969 is an apocalyptic number.

It is an amenable number.

1881923969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881923969 is an equidigital number, since it uses as much as digits as its factorization.

1881923969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 1881923969 is about 43381.1476219798. The cubic root of 1881923969 is about 1234.6220371361.

The spelling of 1881923969 in words is "one billion, eight hundred eighty-one million, nine hundred twenty-three thousand, nine hundred sixty-nine".