947654921 has 2 divisors, whose sum is σ = 947654922. Its totient is φ = 947654920.

The previous prime is 947654867. The next prime is 947654923. The reversal of 947654921 is 129456749.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945870025 + 1784896 = 30755^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 947654921 - 2¹⁰ = 947653897 is a prime.

Together with 947654923, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (947654923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473827460 + 473827461.

It is an arithmetic number, because the mean of its divisors is an integer number (473827461).

Almost surely, 2^947654921 is an apocalyptic number.

It is an amenable number.

947654921 is a deficient number, since it is larger than the sum of its proper divisors (1).

947654921 is an equidigital number, since it uses as much as digits as its factorization.

947654921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 947654921 is about 30784.0043041837. The cubic root of 947654921 is about 982.2380203074.

The spelling of 947654921 in words is "nine hundred forty-seven million, six hundred fifty-four thousand, nine hundred twenty-one".