1921367449 has 2 divisors, whose sum is σ = 1921367450. Its totient is φ = 1921367448.

The previous prime is 1921367443. The next prime is 1921367467. The reversal of 1921367449 is 9447631291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1042837849 + 878529600 = 32293^2 + 29640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921367449 - 2¹¹ = 1921365401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921367399 and 1921367408.

It is not a weakly prime, because it can be changed into another prime (1921367443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960683724 + 960683725.

It is an arithmetic number, because the mean of its divisors is an integer number (960683725).

Almost surely, 2^1921367449 is an apocalyptic number.

It is an amenable number.

1921367449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921367449 is an equidigital number, since it uses as much as digits as its factorization.

1921367449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 1921367449 is about 43833.4056285842. The cubic root of 1921367449 is about 1243.1880005520.

It can be divided in two parts, 1921 and 367449, that added together give a triangular number (369370 = T₈₅₉).

The spelling of 1921367449 in words is "one billion, nine hundred twenty-one million, three hundred sixty-seven thousand, four hundred forty-nine".