121611 has 8 divisors (see below), whose sum is σ = 185344. Its totient is φ = 69480.

The previous prime is 121609. The next prime is 121621. The reversal of 121611 is 116121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121611 - 2¹ = 121609 is a prime.

It is a Duffinian number.

121611 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121611.

It is not an unprimeable number, because it can be changed into a prime (121621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875 + ... + 2916.

It is an arithmetic number, because the mean of its divisors is an integer number (23168).

2¹²¹⁶¹¹ is an apocalyptic number.

121611 is a deficient number, since it is larger than the sum of its proper divisors (63733).

121611 is an equidigital number, since it uses as much as digits as its factorization.

121611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5801.

The product of its digits is 12, while the sum is 12.

The square root of 121611 is about 348.7276874583. The cubic root of 121611 is about 49.5439870202.

Adding to 121611 its reverse (116121), we get a palindrome (237732).

It can be divided in two parts, 1 and 21611, that added together give a palindrome (21612).

The spelling of 121611 in words is "one hundred twenty-one thousand, six hundred eleven".