320551865929 has 3 divisors (see below), whose sum is σ = 320552432103. Its totient is φ = 320551299756.

The previous prime is 320551865861. The next prime is 320551865947. The reversal of 320551865929 is 929568155023.

The square root of 320551865929 is 566173.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 929568155023 = 193 ⋅4816415311.

It can be written as a sum of positive squares in only one way, i.e., 21504756025 + 299047109904 = 146645^2 + 546852^2 .

It is a de Polignac number, because none of the positive numbers 2^k-320551865929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320551865929.

It is not an unprimeable number, because it can be changed into a prime (320551865129) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 283087 + ... + 849259.

It is an arithmetic number, because the mean of its divisors is an integer number (106850810701).

Almost surely, 2^320551865929 is an apocalyptic number.

320551865929 is the 566173-rd square number.

320551865929 is the 283087-th centered octagonal number.

It is an amenable number.

320551865929 is a deficient number, since it is larger than the sum of its proper divisors (566174).

320551865929 is an frugal number, since it uses more digits than its factorization.

320551865929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132346 (or 566173 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 320551865929 in words is "three hundred twenty billion, five hundred fifty-one million, eight hundred sixty-five thousand, nine hundred twenty-nine".