122212557 has 10 divisors (see below), whose sum is σ = 182564558. Its totient is φ = 81474984.

The previous prime is 122212543. The next prime is 122212577. The reversal of 122212557 is 755212221.

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 1454436 = 10989^2 + 1206^2 .

It is not a de Polignac number, because 122212557 - 2⁸ = 122212301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122212557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122212537) 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 9 ways as a sum of consecutive naturals, for example, 754318 + ... + 754479.

Almost surely, 2^122212557 is an apocalyptic number.

It is an amenable number.

122212557 is a deficient number, since it is larger than the sum of its proper divisors (60352001).

122212557 is an equidigital number, since it uses as much as digits as its factorization.

122212557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508809 (or 1508800 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 122212557 is about 11054.9788330869. The cubic root of 122212557 is about 496.2554358187.

Adding to 122212557 its reverse (755212221), we get a palindrome (877424778).

The spelling of 122212557 in words is "one hundred twenty-two million, two hundred twelve thousand, five hundred fifty-seven".