123005551 has 8 divisors (see below), whose sum is σ = 127131264. Its totient is φ = 118889760.

The previous prime is 123005537. The next prime is 123005567. The reversal of 123005551 is 155500321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123005551 - 2⁷ = 123005423 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 (123005521) 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 7 ways as a sum of consecutive naturals, for example, 29445 + ... + 33361.

It is an arithmetic number, because the mean of its divisors is an integer number (15891408).

Almost surely, 2^123005551 is an apocalyptic number.

123005551 is a deficient number, since it is larger than the sum of its proper divisors (4125713).

123005551 is a wasteful number, since it uses less digits than its factorization.

123005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 123005551 is about 11090.7867619930. The cubic root of 123005551 is about 497.3264645630.

Adding to 123005551 its reverse (155500321), we get a palindrome (278505872).

The spelling of 123005551 in words is "one hundred twenty-three million, five thousand, five hundred fifty-one".