201601121 has 2 divisors, whose sum is σ = 201601122. Its totient is φ = 201601120.

The previous prime is 201601097. The next prime is 201601133. The reversal of 201601121 is 121106102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199939600 + 1661521 = 14140^2 + 1289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201601121 is a prime.

It is a super-3 number, since 3×201601121³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 201601096 and 201601105.

It is not a weakly prime, because it can be changed into another prime (201601921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100800560 + 100800561.

It is an arithmetic number, because the mean of its divisors is an integer number (100800561).

Almost surely, 2^201601121 is an apocalyptic number.

It is an amenable number.

201601121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201601121 is an equidigital number, since it uses as much as digits as its factorization.

201601121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 201601121 is about 14198.6309551309. The cubic root of 201601121 is about 586.3599703686.

Adding to 201601121 its reverse (121106102), we get a palindrome (322707223).

It can be divided in two parts, 201601 and 121, that multiplied together give a square (24393721 = 4939²).

The spelling of 201601121 in words is "two hundred one million, six hundred one thousand, one hundred twenty-one".