1220552145 has 80 divisors (see below), whose sum is σ = 2396932560. Its totient is φ = 591446016.

The previous prime is 1220552107. The next prime is 1220552149. The reversal of 1220552145 is 5412550221.

It can be written as a sum of positive squares in 8 ways, for example, as 16184529 + 1204367616 = 4023^2 + 34704^2 .

It is not a de Polignac number, because 1220552145 - 2¹⁰ = 1220551121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1220552149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 196609 + ... + 202721.

It is an arithmetic number, because the mean of its divisors is an integer number (29961657).

Almost surely, 2^1220552145 is an apocalyptic number.

1220552145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220552145 is a deficient number, since it is larger than the sum of its proper divisors (1176380415).

1220552145 is a wasteful number, since it uses less digits than its factorization.

1220552145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176 (or 6167 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1220552145 is about 34936.4014317445. The cubic root of 1220552145 is about 1068.6909034729.

The spelling of 1220552145 in words is "one billion, two hundred twenty million, five hundred fifty-two thousand, one hundred forty-five".