321131542545 has 40 divisors (see below), whose sum is σ = 627990580800. Its totient is φ = 155700139680.

The previous prime is 321131542519. The next prime is 321131542549. The reversal of 321131542545 is 545245131123.

321131542545 is a `hidden beast` number, since 3 + 211 + 3 + 15 + 425 + 4 + 5 = 666.

It is not a de Polignac number, because 321131542545 - 2³⁰ = 320057800721 is a prime.

It is a super-2 number, since 2×321131542545² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321131542549) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36037245 + ... + 36046154.

It is an arithmetic number, because the mean of its divisors is an integer number (15699764520).

Almost surely, 2^321131542545 is an apocalyptic number.

It is an amenable number.

321131542545 is a deficient number, since it is larger than the sum of its proper divisors (306859038255).

321131542545 is a wasteful number, since it uses less digits than its factorization.

321131542545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72083427 (or 72083418 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 321131542545 its reverse (545245131123), we get a palindrome (866376673668).

The spelling of 321131542545 in words is "three hundred twenty-one billion, one hundred thirty-one million, five hundred forty-two thousand, five hundred forty-five".