123654551 has 4 divisors (see below), whose sum is σ = 123694704. Its totient is φ = 123614400.

The previous prime is 123654529. The next prime is 123654569. The reversal of 123654551 is 155456321.

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 123654551 - 2²² = 119460247 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 (123659551) 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, 15035 + ... + 21756.

It is an arithmetic number, because the mean of its divisors is an integer number (30923676).

Almost surely, 2^123654551 is an apocalyptic number.

123654551 is a deficient number, since it is larger than the sum of its proper divisors (40153).

123654551 is an equidigital number, since it uses as much as digits as its factorization.

123654551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40152.

The product of its digits is 18000, while the sum is 32.

The square root of 123654551 is about 11120.0067895663. The cubic root of 123654551 is about 498.1995928495.

It can be divided in two parts, 12 and 3654551, that added together give a palindrome (3654563).

The spelling of 123654551 in words is "one hundred twenty-three million, six hundred fifty-four thousand, five hundred fifty-one".