1020730889261 has 2 divisors, whose sum is σ = 1020730889262. Its totient is φ = 1020730889260.

The previous prime is 1020730889207. The next prime is 1020730889293. The reversal of 1020730889261 is 1629880370201.

It is a happy number.

1020730889261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859041654025 + 161689235236 = 926845^2 + 402106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020730889261 is a prime.

It is a super-2 number, since 2×1020730889261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020730889161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510365444630 + 510365444631.

It is an arithmetic number, because the mean of its divisors is an integer number (510365444631).

Almost surely, 2^{1020730889261} is an apocalyptic number.

It is an amenable number.

1020730889261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020730889261 is an equidigital number, since it uses as much as digits as its factorization.

1020730889261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 1020730889261 in words is "one trillion, twenty billion, seven hundred thirty million, eight hundred eighty-nine thousand, two hundred sixty-one".