1220555245 has 16 divisors (see below), whose sum is σ = 1802666880. Its totient is φ = 772570944.

The previous prime is 1220555213. The next prime is 1220555251. The reversal of 1220555245 is 5425550221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220555245 - 2⁵ = 1220555213 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1340815 + ... + 1341724.

It is an arithmetic number, because the mean of its divisors is an integer number (112666680).

Almost surely, 2^1220555245 is an apocalyptic number.

It is an amenable number.

1220555245 is a deficient number, since it is larger than the sum of its proper divisors (582111635).

1220555245 is a wasteful number, since it uses less digits than its factorization.

1220555245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682564.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 1220555245 is about 34936.4457980488. The cubic root of 1220555245 is about 1068.6918082380.

The spelling of 1220555245 in words is "one billion, two hundred twenty million, five hundred fifty-five thousand, two hundred forty-five".