31450352521 has 12 divisors (see below), whose sum is σ = 37435922832. Its totient is φ = 26330525928.

The previous prime is 31450352519. The next prime is 31450352567. The reversal of 31450352521 is 12525305413.

It is not a de Polignac number, because 31450352521 - 2¹ = 31450352519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31450356521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7461195 + ... + 7465408.

It is an arithmetic number, because the mean of its divisors is an integer number (3119660236).

Almost surely, 2^31450352521 is an apocalyptic number.

It is an amenable number.

31450352521 is a deficient number, since it is larger than the sum of its proper divisors (5985570311).

31450352521 is a wasteful number, since it uses less digits than its factorization.

31450352521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14926660 (or 14926653 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 31450352521 its reverse (12525305413), we get a palindrome (43975657934).

The spelling of 31450352521 in words is "thirty-one billion, four hundred fifty million, three hundred fifty-two thousand, five hundred twenty-one".