201121957 has 2 divisors, whose sum is σ = 201121958. Its totient is φ = 201121956.

The previous prime is 201121919. The next prime is 201121961. The reversal of 201121957 is 759121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158533281 + 42588676 = 12591^2 + 6526^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121957 - 2⁷ = 201121829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560978 + 100560979.

It is an arithmetic number, because the mean of its divisors is an integer number (100560979).

Almost surely, 2^201121957 is an apocalyptic number.

It is an amenable number.

201121957 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121957 is an equidigital number, since it uses as much as digits as its factorization.

201121957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 201121957 is about 14181.7473182961. The cubic root of 201121957 is about 585.8950498721.

The spelling of 201121957 in words is "two hundred one million, one hundred twenty-one thousand, nine hundred fifty-seven".