947516561 has 2 divisors, whose sum is σ = 947516562. Its totient is φ = 947516560.

The previous prime is 947516543. The next prime is 947516587. The reversal of 947516561 is 165615749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847916161 + 99600400 = 29119^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 947516561 - 2¹⁰ = 947515537 is a prime.

It is not a weakly prime, because it can be changed into another prime (947516761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473758280 + 473758281.

It is an arithmetic number, because the mean of its divisors is an integer number (473758281).

Almost surely, 2^947516561 is an apocalyptic number.

It is an amenable number.

947516561 is a deficient number, since it is larger than the sum of its proper divisors (1).

947516561 is an equidigital number, since it uses as much as digits as its factorization.

947516561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 947516561 is about 30781.7569511553. The cubic root of 947516561 is about 982.1902149076.

The spelling of 947516561 in words is "nine hundred forty-seven million, five hundred sixteen thousand, five hundred sixty-one".