31223012011 has 8 divisors (see below), whose sum is σ = 31330913504. Its totient is φ = 31115240640.

The previous prime is 31223011991. The next prime is 31223012083. The reversal of 31223012011 is 11021032213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223012011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223010011) 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 7 ways as a sum of consecutive naturals, for example, 461050 + ... + 524416.

It is an arithmetic number, because the mean of its divisors is an integer number (3916364188).

Almost surely, 2^31223012011 is an apocalyptic number.

31223012011 is a deficient number, since it is larger than the sum of its proper divisors (107901493).

31223012011 is a wasteful number, since it uses less digits than its factorization.

31223012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65061.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31223012011 its reverse (11021032213), we get a palindrome (42244044224).

The spelling of 31223012011 in words is "thirty-one billion, two hundred twenty-three million, twelve thousand, eleven".