1945012892861 has 2 divisors, whose sum is σ = 1945012892862. Its totient is φ = 1945012892860.

The previous prime is 1945012892789. The next prime is 1945012892869. The reversal of 1945012892861 is 1682982105491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1426605692836 + 518407200025 = 1194406^2 + 720005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945012892861 - 2¹⁰ = 1945012891837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1945012892797 and 1945012892806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945012892869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972506446430 + 972506446431.

It is an arithmetic number, because the mean of its divisors is an integer number (972506446431).

Almost surely, 2^{1945012892861} is an apocalyptic number.

It is an amenable number.

1945012892861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945012892861 is an equidigital number, since it uses as much as digits as its factorization.

1945012892861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 1945012892861 in words is "one trillion, nine hundred forty-five billion, twelve million, eight hundred ninety-two thousand, eight hundred sixty-one".