947221 has 4 divisors (see below), whose sum is σ = 1033344. Its totient is φ = 861100.

The previous prime is 947203. The next prime is 947239. The reversal of 947221 is 122749.

947221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122749 = 11 ⋅11159.

It is an interprime number because it is at equal distance from previous prime (947203) and next prime (947239).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-947221 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 (947621) 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, 43045 + ... + 43066.

It is an arithmetic number, because the mean of its divisors is an integer number (258336).

2⁹⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

947221 is a deficient number, since it is larger than the sum of its proper divisors (86123).

947221 is a wasteful number, since it uses less digits than its factorization.

947221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86122.

The product of its digits is 1008, while the sum is 25.

The square root of 947221 is about 973.2527934715. The cubic root of 947221 is about 98.2088078676.

The spelling of 947221 in words is "nine hundred forty-seven thousand, two hundred twenty-one".