1881963081 has 6 divisors (see below), whose sum is σ = 2718391130. Its totient is φ = 1254642048.

The previous prime is 1881963047. The next prime is 1881963101. The reversal of 1881963081 is 1803691881.

1881963081 is a `hidden beast` number, since 1 + 8 + 8 + 1 + 9 + 630 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1273847481 + 608115600 = 35691^2 + 24660^2 .

It is not a de Polignac number, because 1881963081 - 2¹¹ = 1881961033 is a prime.

It is a super-2 number, since 2×1881963081² = 7083570076494025122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881963011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104553496 + ... + 104553513.

Almost surely, 2^1881963081 is an apocalyptic number.

It is an amenable number.

1881963081 is a deficient number, since it is larger than the sum of its proper divisors (836428049).

1881963081 is a wasteful number, since it uses less digits than its factorization.

1881963081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209107015 (or 209107012 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1881963081 is about 43381.5984145352. The cubic root of 1881963081 is about 1234.6305901211.

The spelling of 1881963081 in words is "one billion, eight hundred eighty-one million, nine hundred sixty-three thousand, eighty-one".