1219818881 has 2 divisors, whose sum is σ = 1219818882. Its totient is φ = 1219818880.

The previous prime is 1219818877. The next prime is 1219818937. The reversal of 1219818881 is 1888189121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1003875856 + 215943025 = 31684^2 + 14695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219818881 - 2² = 1219818877 is a prime.

It is a super-2 number, since 2×1219818881² = 2975916204888184322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1219818181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609909440 + 609909441.

It is an arithmetic number, because the mean of its divisors is an integer number (609909441).

Almost surely, 2^1219818881 is an apocalyptic number.

It is an amenable number.

1219818881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219818881 is an equidigital number, since it uses as much as digits as its factorization.

1219818881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 47.

The square root of 1219818881 is about 34925.9055859687. The cubic root of 1219818881 is about 1068.4768501997.

The spelling of 1219818881 in words is "one billion, two hundred nineteen million, eight hundred eighteen thousand, eight hundred eighty-one".