123550551 has 6 divisors (see below), whose sum is σ = 178461920. Its totient is φ = 82367028.

The previous prime is 123550547. The next prime is 123550561. The reversal of 123550551 is 155055321.

It is not a de Polignac number, because 123550551 - 2² = 123550547 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 (123550501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6863911 + ... + 6863928.

Almost surely, 2^123550551 is an apocalyptic number.

123550551 is a deficient number, since it is larger than the sum of its proper divisors (54911369).

123550551 is a wasteful number, since it uses less digits than its factorization.

123550551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13727845 (or 13727842 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 123550551 is about 11115.3295497704. The cubic root of 123550551 is about 498.0598829620.

The spelling of 123550551 in words is "one hundred twenty-three million, five hundred fifty thousand, five hundred fifty-one".