320423953 has 2 divisors, whose sum is σ = 320423954. Its totient is φ = 320423952.

The previous prime is 320423947. The next prime is 320423977. The reversal of 320423953 is 359324023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277822224 + 42601729 = 16668^2 + 6527^2 .

It is an emirp because it is prime and its reverse (359324023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320423953 is a prime.

It is a super-2 number, since 2×320423953² = 205343019312292418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (320423993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160211976 + 160211977.

It is an arithmetic number, because the mean of its divisors is an integer number (160211977).

Almost surely, 2^320423953 is an apocalyptic number.

It is an amenable number.

320423953 is a deficient number, since it is larger than the sum of its proper divisors (1).

320423953 is an equidigital number, since it uses as much as digits as its factorization.

320423953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 320423953 is about 17900.3897443603. The cubic root of 320423953 is about 684.2923076363.

Adding to 320423953 its reverse (359324023), we get a palindrome (679747976).

The spelling of 320423953 in words is "three hundred twenty million, four hundred twenty-three thousand, nine hundred fifty-three".