9454781561 has 2 divisors, whose sum is σ = 9454781562. Its totient is φ = 9454781560.

The previous prime is 9454781549. The next prime is 9454781587. The reversal of 9454781561 is 1651874549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8143979536 + 1310802025 = 90244^2 + 36205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9454781561 is a prime.

It is not a weakly prime, because it can be changed into another prime (9454783561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4727390780 + 4727390781.

It is an arithmetic number, because the mean of its divisors is an integer number (4727390781).

Almost surely, 2^9454781561 is an apocalyptic number.

It is an amenable number.

9454781561 is a deficient number, since it is larger than the sum of its proper divisors (1).

9454781561 is an equidigital number, since it uses as much as digits as its factorization.

9454781561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 50.

The square root of 9454781561 is about 97235.7010619042. The cubic root of 9454781561 is about 2114.5461424444.

The spelling of 9454781561 in words is "nine billion, four hundred fifty-four million, seven hundred eighty-one thousand, five hundred sixty-one".