1220545511 has 2 divisors, whose sum is σ = 1220545512. Its totient is φ = 1220545510.

The previous prime is 1220545507. The next prime is 1220545519. The reversal of 1220545511 is 1155450221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220545511 - 2² = 1220545507 is a prime.

It is a super-2 number, since 2×1220545511² = 2979462688844502242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220545519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610272755 + 610272756.

It is an arithmetic number, because the mean of its divisors is an integer number (610272756).

Almost surely, 2^1220545511 is an apocalyptic number.

1220545511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220545511 is an equidigital number, since it uses as much as digits as its factorization.

1220545511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1220545511 is about 34936.3064876641. The cubic root of 1220545511 is about 1068.6889672704.

Adding to 1220545511 its reverse (1155450221), we get a palindrome (2375995732).

The spelling of 1220545511 in words is "one billion, two hundred twenty million, five hundred forty-five thousand, five hundred eleven".