181870141 has 2 divisors, whose sum is σ = 181870142. Its totient is φ = 181870140.

The previous prime is 181870127. The next prime is 181870151. The reversal of 181870141 is 141078181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179828100 + 2042041 = 13410^2 + 1429^2 .

It is an emirp because it is prime and its reverse (141078181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181870141 - 2¹⁵ = 181837373 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181870111) 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 as a sum of consecutive naturals, namely, 90935070 + 90935071.

It is an arithmetic number, because the mean of its divisors is an integer number (90935071).

Almost surely, 2^181870141 is an apocalyptic number.

It is an amenable number.

181870141 is a deficient number, since it is larger than the sum of its proper divisors (1).

181870141 is an equidigital number, since it uses as much as digits as its factorization.

181870141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 31.

The square root of 181870141 is about 13485.9238096617. The cubic root of 181870141 is about 566.5702952991.

The spelling of 181870141 in words is "one hundred eighty-one million, eight hundred seventy thousand, one hundred forty-one".