122643551 has 4 divisors (see below), whose sum is σ = 122665704. Its totient is φ = 122621400.

The previous prime is 122643527. The next prime is 122643553. The reversal of 122643551 is 155346221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122643551 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 (122643553) 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, 5261 + ... + 16521.

It is an arithmetic number, because the mean of its divisors is an integer number (30666426).

Almost surely, 2^122643551 is an apocalyptic number.

122643551 is a deficient number, since it is larger than the sum of its proper divisors (22153).

122643551 is a wasteful number, since it uses less digits than its factorization.

122643551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22152.

The product of its digits is 7200, while the sum is 29.

The square root of 122643551 is about 11074.4548850045. The cubic root of 122643551 is about 496.8381151160.

Adding to 122643551 its reverse (155346221), we get a palindrome (277989772).

The spelling of 122643551 in words is "one hundred twenty-two million, six hundred forty-three thousand, five hundred fifty-one".