320641155 has 12 divisors (see below), whose sum is σ = 555778080. Its totient is φ = 171008592.

The previous prime is 320641147. The next prime is 320641177. The reversal of 320641155 is 551146023.

320641155 is a `hidden beast` number, since 3 + 2 + 0 + 641 + 15 + 5 = 666.

It is not a de Polignac number, because 320641155 - 2³ = 320641147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3562635 + ... + 3562724.

It is an arithmetic number, because the mean of its divisors is an integer number (46314840).

Almost surely, 2^320641155 is an apocalyptic number.

320641155 is a deficient number, since it is larger than the sum of its proper divisors (235136925).

320641155 is a wasteful number, since it uses less digits than its factorization.

320641155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125370 (or 7125367 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 320641155 is about 17906.4556794470. The cubic root of 320641155 is about 684.4468904276.

Adding to 320641155 its reverse (551146023), we get a palindrome (871787178).

The spelling of 320641155 in words is "three hundred twenty million, six hundred forty-one thousand, one hundred fifty-five".