320140621 has 2 divisors, whose sum is σ = 320140622. Its totient is φ = 320140620.

The previous prime is 320140607. The next prime is 320140649. The reversal of 320140621 is 126041023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222427396 + 97713225 = 14914^2 + 9885^2 .

It is a cyclic number.

It is not a de Polignac number, because 320140621 - 2⁷ = 320140493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320140661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160070310 + 160070311.

It is an arithmetic number, because the mean of its divisors is an integer number (160070311).

Almost surely, 2^320140621 is an apocalyptic number.

It is an amenable number.

320140621 is a deficient number, since it is larger than the sum of its proper divisors (1).

320140621 is an equidigital number, since it uses as much as digits as its factorization.

320140621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 320140621 is about 17892.4738647287. The cubic root of 320140621 is about 684.0905550514.

Adding to 320140621 its reverse (126041023), we get a palindrome (446181644).

The spelling of 320140621 in words is "three hundred twenty million, one hundred forty thousand, six hundred twenty-one".