122311561 has 4 divisors (see below), whose sum is σ = 122333824. Its totient is φ = 122289300.

The previous prime is 122311507. The next prime is 122311571. The reversal of 122311561 is 165113221.

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 a de Polignac number, because none of the positive numbers 2^k-122311561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122311571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3676 + ... + 16066.

It is an arithmetic number, because the mean of its divisors is an integer number (30583456).

Almost surely, 2^122311561 is an apocalyptic number.

It is an amenable number.

122311561 is a deficient number, since it is larger than the sum of its proper divisors (22263).

122311561 is an equidigital number, since it uses as much as digits as its factorization.

122311561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22262.

The product of its digits is 360, while the sum is 22.

The square root of 122311561 is about 11059.4557280184. The cubic root of 122311561 is about 496.3894046277.

Adding to 122311561 its reverse (165113221), we get a palindrome (287424782).

The spelling of 122311561 in words is "one hundred twenty-two million, three hundred eleven thousand, five hundred sixty-one".