31123231013 has 4 divisors (see below), whose sum is σ = 35569406880. Its totient is φ = 26677055148.

The previous prime is 31123231003. The next prime is 31123231081. The reversal of 31123231013 is 31013232113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31123231013 - 2²⁰ = 31122182437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123231003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223087923 + ... + 2223087936.

It is an arithmetic number, because the mean of its divisors is an integer number (8892351720).

Almost surely, 2^31123231013 is an apocalyptic number.

It is an amenable number.

31123231013 is a deficient number, since it is larger than the sum of its proper divisors (4446175867).

31123231013 is an equidigital number, since it uses as much as digits as its factorization.

31123231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446175866.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31123231013 its reverse (31013232113), we get a palindrome (62136463126).

The spelling of 31123231013 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, thirteen".