1944798553 has 2 divisors, whose sum is σ = 1944798554. Its totient is φ = 1944798552.

The previous prime is 1944798503. The next prime is 1944798563. The reversal of 1944798553 is 3558974491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1880349769 + 64448784 = 43363^2 + 8028^2 .

It is an emirp because it is prime and its reverse (3558974491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1944798553 - 2⁹ = 1944798041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1944798494 and 1944798503.

It is not a weakly prime, because it can be changed into another prime (1944798503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972399276 + 972399277.

It is an arithmetic number, because the mean of its divisors is an integer number (972399277).

Almost surely, 2^1944798553 is an apocalyptic number.

It is an amenable number.

1944798553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944798553 is an equidigital number, since it uses as much as digits as its factorization.

1944798553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 55.

The square root of 1944798553 is about 44099.8702152285. The cubic root of 1944798553 is about 1248.2211610932.

The spelling of 1944798553 in words is "one billion, nine hundred forty-four million, seven hundred ninety-eight thousand, five hundred fifty-three".