320325551 has 16 divisors (see below), whose sum is σ = 395304000. Its totient is φ = 252764928.

The previous prime is 320325547. The next prime is 320325553. The reversal of 320325551 is 155523023.

It is not a de Polignac number, because 320325551 - 2² = 320325547 is a prime.

It is a super-3 number, since 3×320325551³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320325551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320325553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30875 + ... + 39923.

It is an arithmetic number, because the mean of its divisors is an integer number (24706500).

Almost surely, 2^320325551 is an apocalyptic number.

320325551 is a deficient number, since it is larger than the sum of its proper divisors (74978449).

320325551 is a wasteful number, since it uses less digits than its factorization.

320325551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 320325551 is about 17897.6409339332. The cubic root of 320325551 is about 684.2222518814. Note that the first 4 decimals are identical.

Adding to 320325551 its reverse (155523023), we get a palindrome (475848574).

The spelling of 320325551 in words is "three hundred twenty million, three hundred twenty-five thousand, five hundred fifty-one".