947921617 has 4 divisors (see below), whose sum is σ = 948697920. Its totient is φ = 947145316.

The previous prime is 947921587. The next prime is 947921657. The reversal of 947921617 is 716129749.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 947921617 - 2¹⁹ = 947397329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (947921657) 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, 386317 + ... + 388762.

It is an arithmetic number, because the mean of its divisors is an integer number (237174480).

Almost surely, 2^947921617 is an apocalyptic number.

It is an amenable number.

947921617 is a deficient number, since it is larger than the sum of its proper divisors (776303).

947921617 is a wasteful number, since it uses less digits than its factorization.

947921617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776302.

The product of its digits is 190512, while the sum is 46.

The square root of 947921617 is about 30788.3357296233. The cubic root of 947921617 is about 982.3301545414.

The spelling of 947921617 in words is "nine hundred forty-seven million, nine hundred twenty-one thousand, six hundred seventeen".