31521054521331 has 10 divisors (see below), whose sum is σ = 47087007371492. Its totient is φ = 21014036347500.

The previous prime is 31521054521321. The next prime is 31521054521351. The reversal of 31521054521331 is 13312545012513.

It is a happy number.

31521054521331 is a `hidden beast` number, since 3 + 1 + 52 + 1 + 0 + 54 + 521 + 3 + 31 = 666.

It is not a de Polignac number, because 31521054521331 - 2⁴² = 27123008010227 is a prime.

It is a super-3 number, since 3×31521054521331³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31521054521311) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 194574410545 + ... + 194574410706.

Almost surely, 2^{31521054521331} is an apocalyptic number.

31521054521331 is a deficient number, since it is larger than the sum of its proper divisors (15565952850161).

31521054521331 is an equidigital number, since it uses as much as digits as its factorization.

31521054521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389148821263 (or 389148821254 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 31521054521331 its reverse (13312545012513), we get a palindrome (44833599533844).

The spelling of 31521054521331 in words is "thirty-one trillion, five hundred twenty-one billion, fifty-four million, five hundred twenty-one thousand, three hundred thirty-one".