181993031 has 8 divisors (see below), whose sum is σ = 199273728. Its totient is φ = 164835000.

The previous prime is 181993027. The next prime is 181993037. The reversal of 181993031 is 130399181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181993031 - 2² = 181993027 is a prime.

It is a super-2 number, since 2×181993031² = 66242926665133922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181992982 and 181993000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181993037) 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 7 ways as a sum of consecutive naturals, for example, 27545 + ... + 33506.

It is an arithmetic number, because the mean of its divisors is an integer number (24909216).

Almost surely, 2^181993031 is an apocalyptic number.

181993031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

181993031 is a deficient number, since it is larger than the sum of its proper divisors (17280697).

181993031 is a wasteful number, since it uses less digits than its factorization.

181993031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61333.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 181993031 is about 13490.4792724351. The cubic root of 181993031 is about 566.6978774428.

The spelling of 181993031 in words is "one hundred eighty-one million, nine hundred ninety-three thousand, thirty-one".