1219802137 has 2 divisors, whose sum is σ = 1219802138. Its totient is φ = 1219802136.

The previous prime is 1219802099. The next prime is 1219802203. The reversal of 1219802137 is 7312089121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986965056 + 232837081 = 31416^2 + 15259^2 .

It is an emirp because it is prime and its reverse (7312089121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1219802137 - 2²³ = 1211413529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1219808137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609901068 + 609901069.

It is an arithmetic number, because the mean of its divisors is an integer number (609901069).

Almost surely, 2^1219802137 is an apocalyptic number.

It is an amenable number.

1219802137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219802137 is an equidigital number, since it uses as much as digits as its factorization.

1219802137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1219802137 is about 34925.6658776894. The cubic root of 1219802137 is about 1068.4719613159.

The spelling of 1219802137 in words is "one billion, two hundred nineteen million, eight hundred two thousand, one hundred thirty-seven".