320561653 has 2 divisors, whose sum is σ = 320561654. Its totient is φ = 320561652.

The previous prime is 320561629. The next prime is 320561693. The reversal of 320561653 is 356165023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293334129 + 27227524 = 17127^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 320561653 - 2²¹ = 318464501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320561693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160280826 + 160280827.

It is an arithmetic number, because the mean of its divisors is an integer number (160280827).

Almost surely, 2^320561653 is an apocalyptic number.

It is an amenable number.

320561653 is a deficient number, since it is larger than the sum of its proper divisors (1).

320561653 is an equidigital number, since it uses as much as digits as its factorization.

320561653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 320561653 is about 17904.2356161887. The cubic root of 320561653 is about 684.3903169094.

The spelling of 320561653 in words is "three hundred twenty million, five hundred sixty-one thousand, six hundred fifty-three".