1219860001 has 2 divisors, whose sum is σ = 1219860002. Its totient is φ = 1219860000.

The previous prime is 1219859999. The next prime is 1219860023. The reversal of 1219860001 is 1000689121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 976500001 + 243360000 = 31249^2 + 15600^2 .

It is an emirp because it is prime and its reverse (1000689121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1219860001 - 2¹ = 1219859999 is a prime.

Together with 1219859999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1219860601) 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, 609930000 + 609930001.

It is an arithmetic number, because the mean of its divisors is an integer number (609930001).

Almost surely, 2^1219860001 is an apocalyptic number.

It is an amenable number.

1219860001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219860001 is an equidigital number, since it uses as much as digits as its factorization.

1219860001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1219860001 is about 34926.4942557938. The cubic root of 1219860001 is about 1068.4888561554.

The spelling of 1219860001 in words is "one billion, two hundred nineteen million, eight hundred sixty thousand, one".