123225551 has 4 divisors (see below), whose sum is σ = 125245704. Its totient is φ = 121205400.

The previous prime is 123225547. The next prime is 123225607. The reversal of 123225551 is 155522321.

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 123225551 - 2² = 123225547 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 123225551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123225521) 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, 1009985 + ... + 1010106.

It is an arithmetic number, because the mean of its divisors is an integer number (31311426).

Almost surely, 2^123225551 is an apocalyptic number.

123225551 is a deficient number, since it is larger than the sum of its proper divisors (2020153).

123225551 is an equidigital number, since it uses as much as digits as its factorization.

123225551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020152.

The product of its digits is 3000, while the sum is 26.

The square root of 123225551 is about 11100.7004733936. The cubic root of 123225551 is about 497.6227835964.

Adding to 123225551 its reverse (155522321), we get a palindrome (278747872).

The spelling of 123225551 in words is "one hundred twenty-three million, two hundred twenty-five thousand, five hundred fifty-one".