181982031 has 24 divisors (see below), whose sum is σ = 307920384. Its totient is φ = 94535280.

The previous prime is 181982023. The next prime is 181982051. The reversal of 181982031 is 130289181.

It is not a de Polignac number, because 181982031 - 2³ = 181982023 is a prime.

It is a super-2 number, since 2×181982031² = 66234919213769922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 181981983 and 181982001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181982011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54655 + ... + 57888.

It is an arithmetic number, because the mean of its divisors is an integer number (12830016).

Almost surely, 2^181982031 is an apocalyptic number.

181982031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

181982031 is a deficient number, since it is larger than the sum of its proper divisors (125938353).

181982031 is a wasteful number, since it uses less digits than its factorization.

181982031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112571 (or 112564 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 181982031 is about 13490.0715713446. The cubic root of 181982031 is about 566.6864597854.

The spelling of 181982031 in words is "one hundred eighty-one million, nine hundred eighty-two thousand, thirty-one".