122135261 has 4 divisors (see below), whose sum is σ = 125436252. Its totient is φ = 118834272.

The previous prime is 122135243. The next prime is 122135291. The reversal of 122135261 is 162531221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162531221 = 4549 ⋅35729.

It can be written as a sum of positive squares in 2 ways, for example, as 108035236 + 14100025 = 10394^2 + 3755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122135261 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 (122135231) 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, 1650440 + ... + 1650513.

It is an arithmetic number, because the mean of its divisors is an integer number (31359063).

Almost surely, 2^122135261 is an apocalyptic number.

It is an amenable number.

122135261 is a deficient number, since it is larger than the sum of its proper divisors (3300991).

122135261 is an equidigital number, since it uses as much as digits as its factorization.

122135261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300990.

The product of its digits is 720, while the sum is 23.

The square root of 122135261 is about 11051.4822987688. The cubic root of 122135261 is about 496.1507912256.

Adding to 122135261 its reverse (162531221), we get a palindrome (284666482).

The spelling of 122135261 in words is "one hundred twenty-two million, one hundred thirty-five thousand, two hundred sixty-one".