183987081 has 6 divisors (see below), whose sum is σ = 265759130. Its totient is φ = 122658048.

The previous prime is 183987061. The next prime is 183987091. The reversal of 183987081 is 180789381.

It can be written as a sum of positive squares in only one way, i.e., 178623225 + 5363856 = 13365^2 + 2316^2 .

It is a de Polignac number, because none of the positive numbers 2^k-183987081 is a prime.

It is a super-2 number, since 2×183987081² = 67702491949801122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (183987061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10221496 + ... + 10221513.

Almost surely, 2^183987081 is an apocalyptic number.

It is an amenable number.

183987081 is a deficient number, since it is larger than the sum of its proper divisors (81772049).

183987081 is a wasteful number, since it uses less digits than its factorization.

183987081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20443015 (or 20443012 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 183987081 is about 13564.1837572336. The cubic root of 183987081 is about 568.7600840944.

The spelling of 183987081 in words is "one hundred eighty-three million, nine hundred eighty-seven thousand, eighty-one".