1220661152 has 36 divisors (see below), whose sum is σ = 2512240290. Its totient is φ = 583786368.

The previous prime is 1220661151. The next prime is 1220661157. The reversal of 1220661152 is 2511660221.

It can be written as a sum of positive squares in only one way, i.e., 995781136 + 224880016 = 31556^2 + 14996^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1220661151) 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 in 5 ways as a sum of consecutive naturals, for example, 19127 + ... + 52982.

Almost surely, 2^1220661152 is an apocalyptic number.

It is an amenable number.

1220661152 is an abundant number, since it is smaller than the sum of its proper divisors (1291579138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220661152 is an equidigital number, since it uses as much as digits as its factorization.

1220661152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72165 (or 72134 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1220661152 is about 34937.9614745909. The cubic root of 1220661152 is about 1068.7227173045.

The spelling of 1220661152 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, one hundred fifty-two".