320841511 has 4 divisors (see below), whose sum is σ = 321103800. Its totient is φ = 320579224.

The previous prime is 320841457. The next prime is 320841557. The reversal of 320841511 is 115148023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115148023 = 43 ⋅2677861.

It is a cyclic number.

It is not a de Polignac number, because 320841511 - 2¹⁹ = 320317223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320841571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129301 + ... + 131758.

It is an arithmetic number, because the mean of its divisors is an integer number (80275950).

Almost surely, 2^320841511 is an apocalyptic number.

320841511 is a deficient number, since it is larger than the sum of its proper divisors (262289).

320841511 is a wasteful number, since it uses less digits than its factorization.

320841511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262288.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 320841511 is about 17912.0493244073. The cubic root of 320841511 is about 684.5894220250.

Adding to 320841511 its reverse (115148023), we get a palindrome (435989534).

The spelling of 320841511 in words is "three hundred twenty million, eight hundred forty-one thousand, five hundred eleven".