155200181 has 2 divisors, whose sum is σ = 155200182. Its totient is φ = 155200180.

The previous prime is 155200153. The next prime is 155200217. The reversal of 155200181 is 181002551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117180625 + 38019556 = 10825^2 + 6166^2 .

It is a cyclic number.

It is not a de Polignac number, because 155200181 - 2¹⁰ = 155199157 is a prime.

It is a super-2 number, since 2×155200181² = 48174192364865522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155220181) 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, 77600090 + 77600091.

It is an arithmetic number, because the mean of its divisors is an integer number (77600091).

Almost surely, 2^155200181 is an apocalyptic number.

It is an amenable number.

155200181 is a deficient number, since it is larger than the sum of its proper divisors (1).

155200181 is an equidigital number, since it uses as much as digits as its factorization.

155200181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 155200181 is about 12457.9364663655. The cubic root of 155200181 is about 537.3996853355.

The spelling of 155200181 in words is "one hundred fifty-five million, two hundred thousand, one hundred eighty-one".