1928961449 has 2 divisors, whose sum is σ = 1928961450. Its totient is φ = 1928961448.

The previous prime is 1928961413. The next prime is 1928961473. The reversal of 1928961449 is 9441698291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1834580224 + 94381225 = 42832^2 + 9715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928961449 - 2⁸ = 1928961193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1928961449.

It is not a weakly prime, because it can be changed into another prime (1928961479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964480724 + 964480725.

It is an arithmetic number, because the mean of its divisors is an integer number (964480725).

Almost surely, 2^1928961449 is an apocalyptic number.

It is an amenable number.

1928961449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928961449 is an equidigital number, since it uses as much as digits as its factorization.

1928961449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 53.

The square root of 1928961449 is about 43919.9436361205. The cubic root of 1928961449 is about 1244.8237034714.

The spelling of 1928961449 in words is "one billion, nine hundred twenty-eight million, nine hundred sixty-one thousand, four hundred forty-nine".