1219223081 has 2 divisors, whose sum is σ = 1219223082. Its totient is φ = 1219223080.

The previous prime is 1219223063. The next prime is 1219223101. The reversal of 1219223081 is 1803229121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 795522025 + 423701056 = 28205^2 + 20584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219223081 is a prime.

It is a super-2 number, since 2×1219223081² = 2973009842486265122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1219223281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609611540 + 609611541.

It is an arithmetic number, because the mean of its divisors is an integer number (609611541).

Almost surely, 2^1219223081 is an apocalyptic number.

It is an amenable number.

1219223081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219223081 is an equidigital number, since it uses as much as digits as its factorization.

1219223081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1219223081 is about 34917.3750588443. The cubic root of 1219223081 is about 1068.3028620252.

The spelling of 1219223081 in words is "one billion, two hundred nineteen million, two hundred twenty-three thousand, eighty-one".