947521 has 4 divisors (see below), whose sum is σ = 953172. Its totient is φ = 941872.

The previous prime is 947509. The next prime is 947539. The reversal of 947521 is 125749.

It is a happy number.

947521 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.

It can be written as a sum of positive squares in 2 ways, for example, as 921600 + 25921 = 960^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 947521 - 2¹¹ = 945473 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 947521.

It is not an unprimeable number, because it can be changed into a prime (947501) 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, 2566 + ... + 2911.

It is an arithmetic number, because the mean of its divisors is an integer number (238293).

2⁹⁴⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

947521 is a deficient number, since it is larger than the sum of its proper divisors (5651).

947521 is a wasteful number, since it uses less digits than its factorization.

947521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650.

The product of its digits is 2520, while the sum is 28.

The square root of 947521 is about 973.4069036123. The cubic root of 947521 is about 98.2191748719.

The spelling of 947521 in words is "nine hundred forty-seven thousand, five hundred twenty-one".