320251513 has 4 divisors (see below), whose sum is σ = 320287348. Its totient is φ = 320215680.

The previous prime is 320251489. The next prime is 320251523. The reversal of 320251513 is 315152023.

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: 315152023 = 73 ⋅4317151.

It can be written as a sum of positive squares in 2 ways, for example, as 265298944 + 54952569 = 16288^2 + 7413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320251513 is a prime.

It is a super-2 number, since 2×320251513² = 205122063157578338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320251523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7645 + ... + 26437.

It is an arithmetic number, because the mean of its divisors is an integer number (80071837).

Almost surely, 2^320251513 is an apocalyptic number.

It is an amenable number.

320251513 is a deficient number, since it is larger than the sum of its proper divisors (35835).

320251513 is a wasteful number, since it uses less digits than its factorization.

320251513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35834.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 320251513 is about 17895.5724412493. The cubic root of 320251513 is about 684.1695322337.

The spelling of 320251513 in words is "three hundred twenty million, two hundred fifty-one thousand, five hundred thirteen".