1220387249 has 2 divisors, whose sum is σ = 1220387250. Its totient is φ = 1220387248.

The previous prime is 1220387197. The next prime is 1220387303. The reversal of 1220387249 is 9427830221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645922225 + 574465024 = 25415^2 + 23968^2 .

It is an emirp because it is prime and its reverse (9427830221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220387249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1220387849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610193624 + 610193625.

It is an arithmetic number, because the mean of its divisors is an integer number (610193625).

Almost surely, 2^1220387249 is an apocalyptic number.

It is an amenable number.

1220387249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220387249 is an equidigital number, since it uses as much as digits as its factorization.

1220387249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1220387249 is about 34934.0414066280. The cubic root of 1220387249 is about 1068.6427747653.

The spelling of 1220387249 in words is "one billion, two hundred twenty million, three hundred eighty-seven thousand, two hundred forty-nine".