1219804113581 has 2 divisors, whose sum is σ = 1219804113582. Its totient is φ = 1219804113580.

The previous prime is 1219804113569. The next prime is 1219804113589. The reversal of 1219804113581 is 1853114089121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191898411081 + 27905702500 = 1091741^2 + 167050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219804113581 is a prime.

It is a super-2 number, since 2×1219804113581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219804113589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609902056790 + 609902056791.

It is an arithmetic number, because the mean of its divisors is an integer number (609902056791).

Almost surely, 2^{1219804113581} is an apocalyptic number.

It is an amenable number.

1219804113581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219804113581 is an equidigital number, since it uses as much as digits as its factorization.

1219804113581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 1219804113581 in words is "one trillion, two hundred nineteen billion, eight hundred four million, one hundred thirteen thousand, five hundred eighty-one".