181142321 has 2 divisors, whose sum is σ = 181142322. Its totient is φ = 181142320.

The previous prime is 181142317. The next prime is 181142341. The reversal of 181142321 is 123241181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180526096 + 616225 = 13436^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 181142321 - 2² = 181142317 is a prime.

It is not a weakly prime, because it can be changed into another prime (181142341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90571160 + 90571161.

It is an arithmetic number, because the mean of its divisors is an integer number (90571161).

Almost surely, 2^181142321 is an apocalyptic number.

It is an amenable number.

181142321 is a deficient number, since it is larger than the sum of its proper divisors (1).

181142321 is an equidigital number, since it uses as much as digits as its factorization.

181142321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 23.

The square root of 181142321 is about 13458.9123260388. The cubic root of 181142321 is about 565.8135053395.

The spelling of 181142321 in words is "one hundred eighty-one million, one hundred forty-two thousand, three hundred twenty-one".