123266551 has 4 divisors (see below), whose sum is σ = 123705504. Its totient is φ = 122827600.

The previous prime is 123266531. The next prime is 123266569. The reversal of 123266551 is 155662321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155662321 = 23 ⋅6767927.

It is a cyclic number.

It is not a de Polignac number, because 123266551 - 2¹⁵ = 123233783 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 (123266531) 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, 219055 + ... + 219616.

It is an arithmetic number, because the mean of its divisors is an integer number (30926376).

Almost surely, 2^123266551 is an apocalyptic number.

123266551 is a deficient number, since it is larger than the sum of its proper divisors (438953).

123266551 is an equidigital number, since it uses as much as digits as its factorization.

123266551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438952.

The product of its digits is 10800, while the sum is 31.

The square root of 123266551 is about 11102.5470501142. The cubic root of 123266551 is about 497.6779676919.

The spelling of 123266551 in words is "one hundred twenty-three million, two hundred sixty-six thousand, five hundred fifty-one".