1981275183 has 12 divisors (see below), whose sum is σ = 3030185808. Its totient is φ = 1243152960.

The previous prime is 1981275169. The next prime is 1981275187. The reversal of 1981275183 is 3815721891.

1981275183 is a `hidden beast` number, since 1 + 9 + 8 + 127 + 518 + 3 = 666.

It is not a de Polignac number, because 1981275183 - 2¹⁷ = 1981144111 is a prime.

It is a super-3 number, since 3×1981275183³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981275187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6474603 + ... + 6474908.

It is an arithmetic number, because the mean of its divisors is an integer number (252515484).

Almost surely, 2^1981275183 is an apocalyptic number.

1981275183 is a deficient number, since it is larger than the sum of its proper divisors (1048910625).

1981275183 is a wasteful number, since it uses less digits than its factorization.

1981275183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12949534 (or 12949531 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 1981275183 is about 44511.5174196522. The cubic root of 1981275183 is about 1255.9767495983.

The spelling of 1981275183 in words is "one billion, nine hundred eighty-one million, two hundred seventy-five thousand, one hundred eighty-three".