9020945561 has 2 divisors, whose sum is σ = 9020945562. Its totient is φ = 9020945560.

The previous prime is 9020945551. The next prime is 9020945579. The reversal of 9020945561 is 1655490209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8157702400 + 863243161 = 90320^2 + 29381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9020945561 is a prime.

It is not a weakly prime, because it can be changed into another prime (9020945551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510472780 + 4510472781.

It is an arithmetic number, because the mean of its divisors is an integer number (4510472781).

Almost surely, 2^9020945561 is an apocalyptic number.

It is an amenable number.

9020945561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9020945561 is an equidigital number, since it uses as much as digits as its factorization.

9020945561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 9020945561 is about 94978.6584502013. The cubic root of 9020945561 is about 2081.6962218463.

The spelling of 9020945561 in words is "nine billion, twenty million, nine hundred forty-five thousand, five hundred sixty-one".