155438201 has 2 divisors, whose sum is σ = 155438202. Its totient is φ = 155438200.

The previous prime is 155438197. The next prime is 155438203. The reversal of 155438201 is 102834551.

155438201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147598201 + 7840000 = 12149^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 155438201 - 2² = 155438197 is a prime.

It is a super-2 number, since 2×155438201² = 48322068660232802, which contains 22 as substring.

Together with 155438203, 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 (155438203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77719100 + 77719101.

It is an arithmetic number, because the mean of its divisors is an integer number (77719101).

Almost surely, 2^155438201 is an apocalyptic number.

It is an amenable number.

155438201 is a deficient number, since it is larger than the sum of its proper divisors (1).

155438201 is an equidigital number, since it uses as much as digits as its factorization.

155438201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 155438201 is about 12467.4857529495. The cubic root of 155438201 is about 537.6742695059.

The spelling of 155438201 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred one".