1944100289561 has 2 divisors, whose sum is σ = 1944100289562. Its totient is φ = 1944100289560.

The previous prime is 1944100289519. The next prime is 1944100289591. The reversal of 1944100289561 is 1659820014491.

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., 1698239017225 + 245861272336 = 1303165^2 + 495844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1944100289561 - 2¹⁴ = 1944100273177 is a prime.

It is a super-3 number, since 3×1944100289561³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1944100289591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972050144780 + 972050144781.

It is an arithmetic number, because the mean of its divisors is an integer number (972050144781).

Almost surely, 2^{1944100289561} is an apocalyptic number.

It is an amenable number.

1944100289561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1944100289561 is an equidigital number, since it uses as much as digits as its factorization.

1944100289561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 1944100289561 in words is "one trillion, nine hundred forty-four billion, one hundred million, two hundred eighty-nine thousand, five hundred sixty-one".