320649061 has 2 divisors, whose sum is σ = 320649062. Its totient is φ = 320649060.

The previous prime is 320649059. The next prime is 320649083. The reversal of 320649061 is 160946023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310852161 + 9796900 = 17631^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 320649061 - 2¹ = 320649059 is a prime.

Together with 320649059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320649661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160324530 + 160324531.

It is an arithmetic number, because the mean of its divisors is an integer number (160324531).

Almost surely, 2^320649061 is an apocalyptic number.

It is an amenable number.

320649061 is a deficient number, since it is larger than the sum of its proper divisors (1).

320649061 is an equidigital number, since it uses as much as digits as its factorization.

320649061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 320649061 is about 17906.6764364580. The cubic root of 320649061 is about 684.4525158155.

The spelling of 320649061 in words is "three hundred twenty million, six hundred forty-nine thousand, sixty-one".