947952721 has 4 divisors (see below), whose sum is σ = 948178944. Its totient is φ = 947726500.

The previous prime is 947952661. The next prime is 947952763. The reversal of 947952721 is 127259749.

It is a happy number.

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 947952721 - 2⁹ = 947952209 is a prime.

It is a super-2 number, since 2×947952721² = 1797228722502607682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (947952781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106705 + ... + 115246.

It is an arithmetic number, because the mean of its divisors is an integer number (237044736).

Almost surely, 2^947952721 is an apocalyptic number.

It is an amenable number.

947952721 is a deficient number, since it is larger than the sum of its proper divisors (226223).

947952721 is a wasteful number, since it uses less digits than its factorization.

947952721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226222.

The product of its digits is 317520, while the sum is 46.

The square root of 947952721 is about 30788.8408518411. The cubic root of 947952721 is about 982.3408987712.

The spelling of 947952721 in words is "nine hundred forty-seven million, nine hundred fifty-two thousand, seven hundred twenty-one".