122657261 has 4 divisors (see below), whose sum is σ = 129872412. Its totient is φ = 115442112.

The previous prime is 122657251. The next prime is 122657267. The reversal of 122657261 is 162756221.

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 83356900 + 39300361 = 9130^2 + 6269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122657261 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 (122657267) 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, 3607550 + ... + 3607583.

It is an arithmetic number, because the mean of its divisors is an integer number (32468103).

Almost surely, 2^122657261 is an apocalyptic number.

It is an amenable number.

122657261 is a deficient number, since it is larger than the sum of its proper divisors (7215151).

122657261 is an equidigital number, since it uses as much as digits as its factorization.

122657261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215150.

The product of its digits is 10080, while the sum is 32.

The square root of 122657261 is about 11075.0738597989. The cubic root of 122657261 is about 496.8566278349.

The spelling of 122657261 in words is "one hundred twenty-two million, six hundred fifty-seven thousand, two hundred sixty-one".