201611121 has 4 divisors (see below), whose sum is σ = 268814832. Its totient is φ = 134407412.

The previous prime is 201611119. The next prime is 201611141. The reversal of 201611121 is 121116102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201611121 - 2¹ = 201611119 is a prime.

It is a super-2 number, since 2×201611121² = 81294088221753282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201611121.

It is not an unprimeable number, because it can be changed into a prime (201611141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33601851 + ... + 33601856.

It is an arithmetic number, because the mean of its divisors is an integer number (67203708).

Almost surely, 2^201611121 is an apocalyptic number.

It is an amenable number.

201611121 is a deficient number, since it is larger than the sum of its proper divisors (67203711).

201611121 is an equidigital number, since it uses as much as digits as its factorization.

201611121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67203710.

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 201611121 is about 14198.9830973912. The cubic root of 201611121 is about 586.3696652597.

Adding to 201611121 its reverse (121116102), we get a palindrome (322727223).

The spelling of 201611121 in words is "two hundred one million, six hundred eleven thousand, one hundred twenty-one".