121611261 has 4 divisors (see below), whose sum is σ = 162148352. Its totient is φ = 81074172.

The previous prime is 121611253. The next prime is 121611271. The reversal of 121611261 is 162116121.

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 not a de Polignac number, because 121611261 - 2³ = 121611253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121611241) 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, 20268541 + ... + 20268546.

It is an arithmetic number, because the mean of its divisors is an integer number (40537088).

Almost surely, 2^121611261 is an apocalyptic number.

It is an amenable number.

121611261 is a deficient number, since it is larger than the sum of its proper divisors (40537091).

121611261 is an equidigital number, since it uses as much as digits as its factorization.

121611261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40537090.

The product of its digits is 144, while the sum is 21.

The square root of 121611261 is about 11027.7495891048. The cubic root of 121611261 is about 495.4402246370.

Adding to 121611261 its reverse (162116121), we get a palindrome (283727382).

The spelling of 121611261 in words is "one hundred twenty-one million, six hundred eleven thousand, two hundred sixty-one".