1220031209 has 2 divisors, whose sum is σ = 1220031210. Its totient is φ = 1220031208.

The previous prime is 1220031181. The next prime is 1220031259. The reversal of 1220031209 is 9021300221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965469184 + 254562025 = 31072^2 + 15955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220031209 - 2¹² = 1220027113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220031259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610015604 + 610015605.

It is an arithmetic number, because the mean of its divisors is an integer number (610015605).

Almost surely, 2^1220031209 is an apocalyptic number.

It is an amenable number.

1220031209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220031209 is an equidigital number, since it uses as much as digits as its factorization.

1220031209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1220031209 is about 34928.9451458243. The cubic root of 1220031209 is about 1068.5388414767.

The spelling of 1220031209 in words is "one billion, two hundred twenty million, thirty-one thousand, two hundred nine".