181641031 has 24 divisors (see below), whose sum is σ = 216086400. Its totient is φ = 151351200.

The previous prime is 181641023. The next prime is 181641037. The reversal of 181641031 is 130146181.

It is a happy number.

It is not a de Polignac number, because 181641031 - 2³ = 181641023 is a prime.

It is a super-2 number, since 2×181641031² = 65986928285485922, 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 = 181640987 and 181641005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181641037) 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 23 ways as a sum of consecutive naturals, for example, 369696 + ... + 370186.

It is an arithmetic number, because the mean of its divisors is an integer number (9003600).

Almost surely, 2^181641031 is an apocalyptic number.

181641031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

181641031 is a deficient number, since it is larger than the sum of its proper divisors (34445369).

181641031 is a wasteful number, since it uses less digits than its factorization.

181641031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 181641031 is about 13477.4267202608. The cubic root of 181641031 is about 566.3322839619.

The spelling of 181641031 in words is "one hundred eighty-one million, six hundred forty-one thousand, thirty-one".