123423551 has 8 divisors (see below), whose sum is σ = 126252480. Its totient is φ = 120603168.

The previous prime is 123423541. The next prime is 123423569. The reversal of 123423551 is 155324321.

It is a happy number.

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 123423551 - 2¹⁸ = 123161407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123423551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123423541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33845 + ... + 37313.

It is an arithmetic number, because the mean of its divisors is an integer number (15781560).

Almost surely, 2^123423551 is an apocalyptic number.

123423551 is a deficient number, since it is larger than the sum of its proper divisors (2828929).

123423551 is an equidigital number, since it uses as much as digits as its factorization.

123423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273.

The product of its digits is 3600, while the sum is 26.

The square root of 123423551 is about 11109.6152498635. The cubic root of 123423551 is about 497.8891693278.

Adding to 123423551 its reverse (155324321), we get a palindrome (278747872).

The spelling of 123423551 in words is "one hundred twenty-three million, four hundred twenty-three thousand, five hundred fifty-one".