1944365557 has 2 divisors, whose sum is σ = 1944365558. Its totient is φ = 1944365556.

The previous prime is 1944365461. The next prime is 1944365561. The reversal of 1944365557 is 7555634491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1791744241 + 152621316 = 42329^2 + 12354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1944365557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1944365557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1944365567) 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, 972182778 + 972182779.

It is an arithmetic number, because the mean of its divisors is an integer number (972182779).

Almost surely, 2^1944365557 is an apocalyptic number.

It is an amenable number.

1944365557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944365557 is an equidigital number, since it uses as much as digits as its factorization.

1944365557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268000, while the sum is 49.

The square root of 1944365557 is about 44094.9606757960. The cubic root of 1944365557 is about 1248.1285182699.

The spelling of 1944365557 in words is "one billion, nine hundred forty-four million, three hundred sixty-five thousand, five hundred fifty-seven".