201121157 has 2 divisors, whose sum is σ = 201121158. Its totient is φ = 201121156.

The previous prime is 201121153. The next prime is 201121171. The reversal of 201121157 is 751121102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192820996 + 8300161 = 13886^2 + 2881^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121157 - 2² = 201121153 is a prime.

It is a super-3 number, since 3×201121157³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560578 + 100560579.

It is an arithmetic number, because the mean of its divisors is an integer number (100560579).

Almost surely, 2^201121157 is an apocalyptic number.

It is an amenable number.

201121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121157 is an equidigital number, since it uses as much as digits as its factorization.

201121157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 201121157 is about 14181.7191129990. The cubic root of 201121157 is about 585.8942730355.

Adding to 201121157 its reverse (751121102), we get a palindrome (952242259).

Subtracting 201121157 from its reverse (751121102), we obtain a palindrome (549999945).

The spelling of 201121157 in words is "two hundred one million, one hundred twenty-one thousand, one hundred fifty-seven".