947897221 has 8 divisors (see below), whose sum is σ = 969408000. Its totient is φ = 926624400.

The previous prime is 947897149. The next prime is 947897263. The reversal of 947897221 is 122798749.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947897221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947897281) 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 7 ways as a sum of consecutive naturals, for example, 51421 + ... + 67378.

It is an arithmetic number, because the mean of its divisors is an integer number (121176000).

Almost surely, 2^947897221 is an apocalyptic number.

It is an amenable number.

947897221 is a deficient number, since it is larger than the sum of its proper divisors (21510779).

947897221 is a wasteful number, since it uses less digits than its factorization.

947897221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118979.

The product of its digits is 508032, while the sum is 49.

The square root of 947897221 is about 30787.9395380724. The cubic root of 947897221 is about 982.3217272863.

The spelling of 947897221 in words is "nine hundred forty-seven million, eight hundred ninety-seven thousand, two hundred twenty-one".