1881135449 has 2 divisors, whose sum is σ = 1881135450. Its totient is φ = 1881135448.

The previous prime is 1881135427. The next prime is 1881135457. The reversal of 1881135449 is 9445311881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1511265625 + 369869824 = 38875^2 + 19232^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881135449 - 2²⁴ = 1864358233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1881135419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940567724 + 940567725.

It is an arithmetic number, because the mean of its divisors is an integer number (940567725).

Almost surely, 2^1881135449 is an apocalyptic number.

It is an amenable number.

1881135449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881135449 is an equidigital number, since it uses as much as digits as its factorization.

1881135449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 1881135449 is about 43372.0583901664. The cubic root of 1881135449 is about 1234.4495788462.

The spelling of 1881135449 in words is "one billion, eight hundred eighty-one million, one hundred thirty-five thousand, four hundred forty-nine".