320331506501 has 2 divisors, whose sum is σ = 320331506502. Its totient is φ = 320331506500.

The previous prime is 320331506483. The next prime is 320331506513. The reversal of 320331506501 is 105605133023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177031404001 + 143300102500 = 420751^2 + 378550^2 .

It is a cyclic number.

It is not a de Polignac number, because 320331506501 - 2²² = 320327312197 is a prime.

It is a super-2 number, since 2×320331506501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320331506701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160165753250 + 160165753251.

It is an arithmetic number, because the mean of its divisors is an integer number (160165753251).

Almost surely, 2^320331506501 is an apocalyptic number.

It is an amenable number.

320331506501 is a deficient number, since it is larger than the sum of its proper divisors (1).

320331506501 is an equidigital number, since it uses as much as digits as its factorization.

320331506501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 29.

Adding to 320331506501 its reverse (105605133023), we get a palindrome (425936639524).

The spelling of 320331506501 in words is "three hundred twenty billion, three hundred thirty-one million, five hundred six thousand, five hundred one".