2184975981 has 12 divisors (see below), whose sum is σ = 3156485020. Its totient is φ = 1456462080.

The previous prime is 2184975973. The next prime is 2184976009. The reversal of 2184975981 is 1895794812.

It is a happy number.

2184975981 is a `hidden beast` number, since 2 + 1 + 8 + 49 + 7 + 598 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1220873481 + 964102500 = 34941^2 + 31050^2 .

It is not a de Polignac number, because 2184975981 - 2³ = 2184975973 is a prime.

It is a super-2 number, since 2×2184975981² = 9548240075093824722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2184975931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114141 + ... + 131901.

Almost surely, 2^2184975981 is an apocalyptic number.

It is an amenable number.

2184975981 is a deficient number, since it is larger than the sum of its proper divisors (971509039).

2184975981 is a wasteful number, since it uses less digits than its factorization.

2184975981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31436 (or 31433 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 2184975981 is about 46743.7266486103. The cubic root of 2184975981 is about 1297.6240588831.

The spelling of 2184975981 in words is "two billion, one hundred eighty-four million, nine hundred seventy-five thousand, nine hundred eighty-one".