1220551187 has 2 divisors, whose sum is σ = 1220551188. Its totient is φ = 1220551186.

The previous prime is 1220551183. The next prime is 1220551201. The reversal of 1220551187 is 7811550221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220551187 - 2² = 1220551183 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220551183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610275593 + 610275594.

It is an arithmetic number, because the mean of its divisors is an integer number (610275594).

Almost surely, 2^1220551187 is an apocalyptic number.

1220551187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220551187 is an equidigital number, since it uses as much as digits as its factorization.

1220551187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 1220551187 is about 34936.3877211139. The cubic root of 1220551187 is about 1068.6906238709.

The spelling of 1220551187 in words is "one billion, two hundred twenty million, five hundred fifty-one thousand, one hundred eighty-seven".