123432551 has 4 divisors (see below), whose sum is σ = 134653704. Its totient is φ = 112211400.

The previous prime is 123432541. The next prime is 123432553. The reversal of 123432551 is 155234321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123432551 - 2⁶ = 123432487 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 123432551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123432553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5610560 + ... + 5610581.

It is an arithmetic number, because the mean of its divisors is an integer number (33663426).

Almost surely, 2^123432551 is an apocalyptic number.

123432551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123432551 is a deficient number, since it is larger than the sum of its proper divisors (11221153).

123432551 is a wasteful number, since it uses less digits than its factorization.

123432551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11221152.

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

The square root of 123432551 is about 11110.0202970112. The cubic root of 123432551 is about 497.9012709988.

Adding to 123432551 its reverse (155234321), we get a palindrome (278666872).

The spelling of 123432551 in words is "one hundred twenty-three million, four hundred thirty-two thousand, five hundred fifty-one".