31231023213 has 16 divisors (see below), whose sum is σ = 44951088896. Its totient is φ = 19173430080.

The previous prime is 31231023209. The next prime is 31231023283. The reversal of 31231023213 is 31232013213.

It is not a de Polignac number, because 31231023213 - 2² = 31231023209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31231023213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231023283) 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, 934645 + ... + 967482.

It is an arithmetic number, because the mean of its divisors is an integer number (2809443056).

Almost surely, 2^31231023213 is an apocalyptic number.

It is an amenable number.

31231023213 is a deficient number, since it is larger than the sum of its proper divisors (13720065683).

31231023213 is a wasteful number, since it uses less digits than its factorization.

31231023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902564.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31231023213 its reverse (31232013213), we get a palindrome (62463036426).

The spelling of 31231023213 in words is "thirty-one billion, two hundred thirty-one million, twenty-three thousand, two hundred thirteen".