1220312111 has 2 divisors, whose sum is σ = 1220312112. Its totient is φ = 1220312110.

The previous prime is 1220312101. The next prime is 1220312129. The reversal of 1220312111 is 1112130221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220312111 - 2⁶ = 1220312047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220312101) 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 as a sum of consecutive naturals, namely, 610156055 + 610156056.

It is an arithmetic number, because the mean of its divisors is an integer number (610156056).

Almost surely, 2^1220312111 is an apocalyptic number.

1220312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220312111 is an equidigital number, since it uses as much as digits as its factorization.

1220312111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1220312111 is about 34932.9659633991. The cubic root of 1220312111 is about 1068.6208425661.

Adding to 1220312111 its reverse (1112130221), we get a palindrome (2332442332).

The spelling of 1220312111 in words is "one billion, two hundred twenty million, three hundred twelve thousand, one hundred eleven".