947862661 has 2 divisors, whose sum is σ = 947862662. Its totient is φ = 947862660.

The previous prime is 947862613. The next prime is 947862667. The reversal of 947862661 is 166268749.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823116100 + 124746561 = 28690^2 + 11169^2 .

It is an emirp because it is prime and its reverse (166268749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 947862661 - 2⁷ = 947862533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (947862667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473931330 + 473931331.

It is an arithmetic number, because the mean of its divisors is an integer number (473931331).

Almost surely, 2^947862661 is an apocalyptic number.

It is an amenable number.

947862661 is a deficient number, since it is larger than the sum of its proper divisors (1).

947862661 is an equidigital number, since it uses as much as digits as its factorization.

947862661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 947862661 is about 30787.3782742214. The cubic root of 947862661 is about 982.3097887727.

The spelling of 947862661 in words is "nine hundred forty-seven million, eight hundred sixty-two thousand, six hundred sixty-one".