122643251 has 2 divisors, whose sum is σ = 122643252. Its totient is φ = 122643250.

The previous prime is 122643229. The next prime is 122643281. The reversal of 122643251 is 152346221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122643251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122643251.

It is not a weakly prime, because it can be changed into another prime (122643281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61321625 + 61321626.

It is an arithmetic number, because the mean of its divisors is an integer number (61321626).

Almost surely, 2^122643251 is an apocalyptic number.

122643251 is a deficient number, since it is larger than the sum of its proper divisors (1).

122643251 is an equidigital number, since it uses as much as digits as its factorization.

122643251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 122643251 is about 11074.4413403115. The cubic root of 122643251 is about 496.8377100082.

Adding to 122643251 its reverse (152346221), we get a palindrome (274989472).

The spelling of 122643251 in words is "one hundred twenty-two million, six hundred forty-three thousand, two hundred fifty-one".