122640253 has 2 divisors, whose sum is σ = 122640254. Its totient is φ = 122640252.

The previous prime is 122640241. The next prime is 122640281. The reversal of 122640253 is 352046221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72556324 + 50083929 = 8518^2 + 7077^2 .

It is an emirp because it is prime and its reverse (352046221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122640253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122640223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61320126 + 61320127.

It is an arithmetic number, because the mean of its divisors is an integer number (61320127).

Almost surely, 2^122640253 is an apocalyptic number.

It is an amenable number.

122640253 is a deficient number, since it is larger than the sum of its proper divisors (1).

122640253 is an equidigital number, since it uses as much as digits as its factorization.

122640253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 122640253 is about 11074.3059827693. The cubic root of 122640253 is about 496.8336615952.

Adding to 122640253 its reverse (352046221), we get a palindrome (474686474).

The spelling of 122640253 in words is "one hundred twenty-two million, six hundred forty thousand, two hundred fifty-three".