31220315011 has 2 divisors, whose sum is σ = 31220315012. Its totient is φ = 31220315010.

The previous prime is 31220314999. The next prime is 31220315029. The reversal of 31220315011 is 11051302213.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220315011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220315011.

It is not a weakly prime, because it can be changed into another prime (31220315111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610157505 + 15610157506.

It is an arithmetic number, because the mean of its divisors is an integer number (15610157506).

Almost surely, 2^31220315011 is an apocalyptic number.

31220315011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220315011 is an equidigital number, since it uses as much as digits as its factorization.

31220315011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 31220315011 its reverse (11051302213), we get a palindrome (42271617224).

The spelling of 31220315011 in words is "thirty-one billion, two hundred twenty million, three hundred fifteen thousand, eleven".