181405841 has 2 divisors, whose sum is σ = 181405842. Its totient is φ = 181405840.

The previous prime is 181405837. The next prime is 181405867. The reversal of 181405841 is 148504181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136983616 + 44422225 = 11704^2 + 6665^2 .

It is a cyclic number.

It is not a de Polignac number, because 181405841 - 2² = 181405837 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 181405798 and 181405807.

It is not a weakly prime, because it can be changed into another prime (181405891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90702920 + 90702921.

It is an arithmetic number, because the mean of its divisors is an integer number (90702921).

Almost surely, 2^181405841 is an apocalyptic number.

It is an amenable number.

181405841 is a deficient number, since it is larger than the sum of its proper divisors (1).

181405841 is an equidigital number, since it uses as much as digits as its factorization.

181405841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 181405841 is about 13468.6985637069. The cubic root of 181405841 is about 566.0877481356.

The spelling of 181405841 in words is "one hundred eighty-one million, four hundred five thousand, eight hundred forty-one".