320144729 has 2 divisors, whose sum is σ = 320144730. Its totient is φ = 320144728.

The previous prime is 320144723. The next prime is 320144753. The reversal of 320144729 is 927441023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193627225 + 126517504 = 13915^2 + 11248^2 .

It is a cyclic number.

It is not a de Polignac number, because 320144729 - 2²⁴ = 303367513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 320144695 and 320144704.

It is not a weakly prime, because it can be changed into another prime (320144723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160072364 + 160072365.

It is an arithmetic number, because the mean of its divisors is an integer number (160072365).

Almost surely, 2^320144729 is an apocalyptic number.

It is an amenable number.

320144729 is a deficient number, since it is larger than the sum of its proper divisors (1).

320144729 is an equidigital number, since it uses as much as digits as its factorization.

320144729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 320144729 is about 17892.5886612307. The cubic root of 320144729 is about 684.0934810906.

The spelling of 320144729 in words is "three hundred twenty million, one hundred forty-four thousand, seven hundred twenty-nine".