320129977 has 2 divisors, whose sum is σ = 320129978. Its totient is φ = 320129976.

The previous prime is 320129959. The next prime is 320129987. The reversal of 320129977 is 779921023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185477161 + 134652816 = 13619^2 + 11604^2 .

It is a cyclic number.

It is not a de Polignac number, because 320129977 - 2²³ = 311741369 is a prime.

It is not a weakly prime, because it can be changed into another prime (320129947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160064988 + 160064989.

It is an arithmetic number, because the mean of its divisors is an integer number (160064989).

Almost surely, 2^320129977 is an apocalyptic number.

It is an amenable number.

320129977 is a deficient number, since it is larger than the sum of its proper divisors (1).

320129977 is an equidigital number, since it uses as much as digits as its factorization.

320129977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 320129977 is about 17892.1764187591. The cubic root of 320129977 is about 684.0829734450.

The spelling of 320129977 in words is "three hundred twenty million, one hundred twenty-nine thousand, nine hundred seventy-seven".