947559661 has 4 divisors (see below), whose sum is σ = 950980732. Its totient is φ = 944138592.

The previous prime is 947559649. The next prime is 947559667. The reversal of 947559661 is 166955749.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 305900100 + 641659561 = 17490^2 + 25331^2 .

It is a cyclic number.

It is not a de Polignac number, because 947559661 - 2⁷ = 947559533 is a prime.

It is a super-2 number, since 2×947559661² = 1795738622308869842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 947559599 and 947559608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947559667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1710120 + ... + 1710673.

It is an arithmetic number, because the mean of its divisors is an integer number (237745183).

Almost surely, 2^947559661 is an apocalyptic number.

It is an amenable number.

947559661 is a deficient number, since it is larger than the sum of its proper divisors (3421071).

947559661 is a wasteful number, since it uses less digits than its factorization.

947559661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421070.

The product of its digits is 2041200, while the sum is 52.

The square root of 947559661 is about 30782.4570331869. The cubic root of 947559661 is about 982.2051070858.

The spelling of 947559661 in words is "nine hundred forty-seven million, five hundred fifty-nine thousand, six hundred sixty-one".