1220555207 has 2 divisors, whose sum is σ = 1220555208. Its totient is φ = 1220555206.

The previous prime is 1220555113. The next prime is 1220555213. The reversal of 1220555207 is 7025550221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220555207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220555207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220455207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610277603 + 610277604.

It is an arithmetic number, because the mean of its divisors is an integer number (610277604).

Almost surely, 2^1220555207 is an apocalyptic number.

1220555207 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220555207 is an equidigital number, since it uses as much as digits as its factorization.

1220555207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 1220555207 is about 34936.4452542041. The cubic root of 1220555207 is about 1068.6917971473.

The spelling of 1220555207 in words is "one billion, two hundred twenty million, five hundred fifty-five thousand, two hundred seven".