31243450251 has 16 divisors (see below), whose sum is σ = 45531981824. Its totient is φ = 18939770784.

The previous prime is 31243450247. The next prime is 31243450253. The reversal of 31243450251 is 15205434213.

It is not a de Polignac number, because 31243450251 - 2² = 31243450247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243450253) 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 15 ways as a sum of consecutive naturals, for example, 5975851 + ... + 5981076.

It is an arithmetic number, because the mean of its divisors is an integer number (2845748864).

Almost surely, 2^31243450251 is an apocalyptic number.

31243450251 is a deficient number, since it is larger than the sum of its proper divisors (14288531573).

31243450251 is a wasteful number, since it uses less digits than its factorization.

31243450251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957010.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 31243450251 its reverse (15205434213), we get a palindrome (46448884464).

The spelling of 31243450251 in words is "thirty-one billion, two hundred forty-three million, four hundred fifty thousand, two hundred fifty-one".