1221502237 has 2 divisors, whose sum is σ = 1221502238. Its totient is φ = 1221502236.

The previous prime is 1221502189. The next prime is 1221502291. The reversal of 1221502237 is 7322051221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1200899716 + 20602521 = 34654^2 + 4539^2 .

It is an emirp because it is prime and its reverse (7322051221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221502237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221502537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610751118 + 610751119.

It is an arithmetic number, because the mean of its divisors is an integer number (610751119).

Almost surely, 2^1221502237 is an apocalyptic number.

It is an amenable number.

1221502237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221502237 is an equidigital number, since it uses as much as digits as its factorization.

1221502237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1221502237 is about 34949.9962374819. The cubic root of 1221502237 is about 1068.9681253682.

Adding to 1221502237 its reverse (7322051221), we get a palindrome (8543553458).

The spelling of 1221502237 in words is "one billion, two hundred twenty-one million, five hundred two thousand, two hundred thirty-seven".