321131525413 has 4 divisors (see below), whose sum is σ = 323286770700. Its totient is φ = 318976280128.

The previous prime is 321131525381. The next prime is 321131525431. The reversal of 321131525413 is 314525131123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152323942369 + 168807583044 = 390287^2 + 410862^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131525413 - 2⁵ = 321131525381 is a prime.

It is a super-2 number, since 2×321131525413² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321131525483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077622420 + ... + 1077622717.

It is an arithmetic number, because the mean of its divisors is an integer number (80821692675).

Almost surely, 2^321131525413 is an apocalyptic number.

It is an amenable number.

321131525413 is a deficient number, since it is larger than the sum of its proper divisors (2155245287).

321131525413 is a wasteful number, since it uses less digits than its factorization.

321131525413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155245286.

The product of its digits is 10800, while the sum is 31.

Adding to 321131525413 its reverse (314525131123), we get a palindrome (635656656536).

The spelling of 321131525413 in words is "three hundred twenty-one billion, one hundred thirty-one million, five hundred twenty-five thousand, four hundred thirteen".