1881348981 has 8 divisors (see below), whose sum is σ = 2510860800. Its totient is φ = 1253034912.

The previous prime is 1881348971. The next prime is 1881349031. The reversal of 1881348981 is 1898431881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1881348981 - 2²⁶ = 1814240117 is a prime.

It is a super-2 number, since 2×1881348981² = 7078947976619476722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881348941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295765 + ... + 302058.

It is an arithmetic number, because the mean of its divisors is an integer number (313857600).

Almost surely, 2^1881348981 is an apocalyptic number.

It is an amenable number.

1881348981 is a deficient number, since it is larger than the sum of its proper divisors (629511819).

1881348981 is a wasteful number, since it uses less digits than its factorization.

1881348981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598875.

The product of its digits is 442368, while the sum is 51.

The square root of 1881348981 is about 43374.5199512340. The cubic root of 1881348981 is about 1234.4962854802.

It can be divided in two parts, 1881 and 348981, that multiplied together give a triangular number (656433261 = T₃₆₂₃₃).

The spelling of 1881348981 in words is "one billion, eight hundred eighty-one million, three hundred forty-eight thousand, nine hundred eighty-one".