947864621 has 4 divisors (see below), whose sum is σ = 1034034144. Its totient is φ = 861695100.

The previous prime is 947864591. The next prime is 947864633. The reversal of 947864621 is 126468749.

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: 126468749 = 11 ⋅11497159.

It is a cyclic number.

It is not a de Polignac number, because 947864621 - 2¹⁰ = 947863597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947864521) 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, 43084745 + ... + 43084766.

It is an arithmetic number, because the mean of its divisors is an integer number (258508536).

Almost surely, 2^947864621 is an apocalyptic number.

It is an amenable number.

947864621 is a deficient number, since it is larger than the sum of its proper divisors (86169523).

947864621 is a wasteful number, since it uses less digits than its factorization.

947864621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86169522.

The product of its digits is 580608, while the sum is 47.

The square root of 947864621 is about 30787.4101054311. The cubic root of 947864621 is about 982.3104658489.

It can be divided in two parts, 947 and 864621, that added together give a palindrome (865568).

The spelling of 947864621 in words is "nine hundred forty-seven million, eight hundred sixty-four thousand, six hundred twenty-one".