320691029 has 2 divisors, whose sum is σ = 320691030. Its totient is φ = 320691028.

The previous prime is 320691023. The next prime is 320691031. The reversal of 320691029 is 920196023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296700625 + 23990404 = 17225^2 + 4898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320691029 is a prime.

It is a Sophie Germain prime.

Together with 320691031, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320690986 and 320691004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320691023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160345514 + 160345515.

It is an arithmetic number, because the mean of its divisors is an integer number (160345515).

Almost surely, 2^320691029 is an apocalyptic number.

It is an amenable number.

320691029 is a deficient number, since it is larger than the sum of its proper divisors (1).

320691029 is an equidigital number, since it uses as much as digits as its factorization.

320691029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 320691029 is about 17907.8482515349. The cubic root of 320691029 is about 684.4823759269.

The spelling of 320691029 in words is "three hundred twenty million, six hundred ninety-one thousand, twenty-nine".