320621155 has 8 divisors (see below), whose sum is σ = 384899472. Its totient is φ = 256394208.

The previous prime is 320621137. The next prime is 320621159. The reversal of 320621155 is 551126023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320621155 - 2⁷ = 320621027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320621159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2577 + ... + 25453.

It is an arithmetic number, because the mean of its divisors is an integer number (48112434).

Almost surely, 2^320621155 is an apocalyptic number.

320621155 is a deficient number, since it is larger than the sum of its proper divisors (64278317).

320621155 is a wasteful number, since it uses less digits than its factorization.

320621155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25685.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 320621155 is about 17905.8972129296. The cubic root of 320621155 is about 684.4326593344.

Adding to 320621155 its reverse (551126023), we get a palindrome (871747178).

The spelling of 320621155 in words is "three hundred twenty million, six hundred twenty-one thousand, one hundred fifty-five".