921005947 has 2 divisors, whose sum is σ = 921005948. Its totient is φ = 921005946.

The previous prime is 921005941. The next prime is 921005977. The reversal of 921005947 is 749500129.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921005947 - 2⁷ = 921005819 is a prime.

It is equal to p_47028457 and since 921005947 and 47028457 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (921005941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460502973 + 460502974.

It is an arithmetic number, because the mean of its divisors is an integer number (460502974).

Almost surely, 2^921005947 is an apocalyptic number.

921005947 is a deficient number, since it is larger than the sum of its proper divisors (1).

921005947 is an equidigital number, since it uses as much as digits as its factorization.

921005947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 921005947 is about 30348.0797909851. The cubic root of 921005947 is about 972.9431800005.

The spelling of 921005947 in words is "nine hundred twenty-one million, five thousand, nine hundred forty-seven".