1881217129 has 9 divisors (see below), whose sum is σ = 2068308669. Its totient is φ = 1709763660.

The previous prime is 1881217109. The next prime is 1881217141. The reversal of 1881217129 is 9217121881.

The square root of 1881217129 is 43373.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1881217129 - 2⁵ = 1881217097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1881217091 and 1881217100.

It is not an unprimeable number, because it can be changed into a prime (1881217109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 475132 + ... + 479074.

Almost surely, 2^1881217129 is an apocalyptic number.

1881217129 is the 43373-rd square number.

1881217129 is the 21687-th centered octagonal number.

It is an amenable number.

1881217129 is a deficient number, since it is larger than the sum of its proper divisors (187091540).

1881217129 is an frugal number, since it uses more digits than its factorization.

1881217129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908 (or 3954 counting only the distinct ones).

The product of its digits is 16128, while the sum is 40.

The cubic root of 1881217129 is about 1234.4674454282.

The spelling of 1881217129 in words is "one billion, eight hundred eighty-one million, two hundred seventeen thousand, one hundred twenty-nine".