947090857 has 4 divisors (see below), whose sum is σ = 970190676. Its totient is φ = 923991040.

The previous prime is 947090779. The next prime is 947090861. The reversal of 947090857 is 758090749.

It is a happy number.

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 534025881 + 413064976 = 23109^2 + 20324^2 .

It is a cyclic number.

It is not a de Polignac number, because 947090857 - 2¹⁵ = 947058089 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 947090857.

It is not an unprimeable number, because it can be changed into a prime (947090897) 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 in 3 ways as a sum of consecutive naturals, for example, 11549848 + ... + 11549929.

It is an arithmetic number, because the mean of its divisors is an integer number (242547669).

Almost surely, 2^947090857 is an apocalyptic number.

It is an amenable number.

947090857 is a deficient number, since it is larger than the sum of its proper divisors (23099819).

947090857 is a wasteful number, since it uses less digits than its factorization.

947090857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23099818.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 947090857 is about 30774.8412993471. The cubic root of 947090857 is about 982.0430987675.

The spelling of 947090857 in words is "nine hundred forty-seven million, ninety thousand, eight hundred fifty-seven".