122731261 has 4 divisors (see below), whose sum is σ = 123946524. Its totient is φ = 121516000.

The previous prime is 122731253. The next prime is 122731283. The reversal of 122731261 is 162137221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110376036 + 12355225 = 10506^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 122731261 - 2³ = 122731253 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 (122731291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607480 + ... + 607681.

It is an arithmetic number, because the mean of its divisors is an integer number (30986631).

Almost surely, 2^122731261 is an apocalyptic number.

It is an amenable number.

122731261 is a deficient number, since it is larger than the sum of its proper divisors (1215263).

122731261 is a wasteful number, since it uses less digits than its factorization.

122731261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215262.

The product of its digits is 1008, while the sum is 25.

The square root of 122731261 is about 11078.4141915709. The cubic root of 122731261 is about 496.9565267962.

Adding to 122731261 its reverse (162137221), we get a palindrome (284868482).

The spelling of 122731261 in words is "one hundred twenty-two million, seven hundred thirty-one thousand, two hundred sixty-one".