321679513 has 4 divisors (see below), whose sum is σ = 332771940. Its totient is φ = 310587088.

The previous prime is 321679493. The next prime is 321679543. The reversal of 321679513 is 315976123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315976123 = 1291 ⋅244753.

It can be written as a sum of positive squares in 2 ways, for example, as 229461904 + 92217609 = 15148^2 + 9603^2 .

It is a cyclic number.

It is not a de Polignac number, because 321679513 - 2¹³ = 321671321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321679543) 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 3 ways as a sum of consecutive naturals, for example, 5546170 + ... + 5546227.

It is an arithmetic number, because the mean of its divisors is an integer number (83192985).

Almost surely, 2^321679513 is an apocalyptic number.

It is an amenable number.

321679513 is a deficient number, since it is larger than the sum of its proper divisors (11092427).

321679513 is a wasteful number, since it uses less digits than its factorization.

321679513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11092426.

The product of its digits is 34020, while the sum is 37.

The square root of 321679513 is about 17935.4262006789. The cubic root of 321679513 is about 685.1849274275.

The spelling of 321679513 in words is "three hundred twenty-one million, six hundred seventy-nine thousand, five hundred thirteen".