155201 has 2 divisors, whose sum is σ = 155202. Its totient is φ = 155200.

The previous prime is 155191. The next prime is 155203. The reversal of 155201 is 102551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115600 + 39601 = 340^2 + 199^2 .

It is an emirp because it is prime and its reverse (102551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155201 - 2⁶ = 155137 is a prime.

Together with 155203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77600 + 77601.

It is an arithmetic number, because the mean of its divisors is an integer number (77601).

2¹⁵⁵²⁰¹ is an apocalyptic number.

It is an amenable number.

155201 is a deficient number, since it is larger than the sum of its proper divisors (1).

155201 is an equidigital number, since it uses as much as digits as its factorization.

155201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 155201 is about 393.9555812525. The cubic root of 155201 is about 53.7400630630.

Adding to 155201 its reverse (102551), we get a palindrome (257752).

Subtracting from 155201 its reverse (102551), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 155201 in words is "one hundred fifty-five thousand, two hundred one".