320129947 has 2 divisors, whose sum is σ = 320129948. Its totient is φ = 320129946.

The previous prime is 320129933. The next prime is 320129959. The reversal of 320129947 is 749921023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320129947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320129977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160064973 + 160064974.

It is an arithmetic number, because the mean of its divisors is an integer number (160064974).

Almost surely, 2^320129947 is an apocalyptic number.

320129947 is a deficient number, since it is larger than the sum of its proper divisors (1).

320129947 is an equidigital number, since it uses as much as digits as its factorization.

320129947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 320129947 is about 17892.1755804039. The cubic root of 320129947 is about 684.0829520761.

The spelling of 320129947 in words is "three hundred twenty million, one hundred twenty-nine thousand, nine hundred forty-seven".