201557 has 2 divisors, whose sum is σ = 201558. Its totient is φ = 201556.

The previous prime is 201547. The next prime is 201577. The reversal of 201557 is 755102.

201557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (201577) can be obtained adding 201557 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192721 + 8836 = 439^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 201557 - 2⁶ = 201493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100778 + 100779.

It is an arithmetic number, because the mean of its divisors is an integer number (100779).

2²⁰¹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

201557 is a deficient number, since it is larger than the sum of its proper divisors (1).

201557 is an equidigital number, since it uses as much as digits as its factorization.

201557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 201557 is about 448.9509995534. The cubic root of 201557 is about 58.6317191711.

Adding to 201557 its reverse (755102), we get a palindrome (956659).

The spelling of 201557 in words is "two hundred one thousand, five hundred fifty-seven".