181641023 has 2 divisors, whose sum is σ = 181641024. Its totient is φ = 181641022.

The previous prime is 181641013. The next prime is 181641037. The reversal of 181641023 is 320146181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181641023 - 2¹² = 181636927 is a prime.

It is a super-2 number, since 2×181641023² = 65986922472973058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181640983 and 181641001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181641013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90820511 + 90820512.

It is an arithmetic number, because the mean of its divisors is an integer number (90820512).

Almost surely, 2^181641023 is an apocalyptic number.

181641023 is a deficient number, since it is larger than the sum of its proper divisors (1).

181641023 is an equidigital number, since it uses as much as digits as its factorization.

181641023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 181641023 is about 13477.4264234682. The cubic root of 181641023 is about 566.3322756476.

The spelling of 181641023 in words is "one hundred eighty-one million, six hundred forty-one thousand, twenty-three".