123551885 has 4 divisors (see below), whose sum is σ = 148262268. Its totient is φ = 98841504.

The previous prime is 123551873. The next prime is 123551893. The reversal of 123551885 is 588155321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14600041 + 108951844 = 3821^2 + 10438^2 .

It is a cyclic number.

It is not a de Polignac number, because 123551885 - 2⁶ = 123551821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12355184 + ... + 12355193.

It is an arithmetic number, because the mean of its divisors is an integer number (37065567).

Almost surely, 2^123551885 is an apocalyptic number.

It is an amenable number.

123551885 is a deficient number, since it is larger than the sum of its proper divisors (24710383).

123551885 is an equidigital number, since it uses as much as digits as its factorization.

123551885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24710382.

The product of its digits is 48000, while the sum is 38.

The square root of 123551885 is about 11115.3895568262. The cubic root of 123551885 is about 498.0616755063.

The spelling of 123551885 in words is "one hundred twenty-three million, five hundred fifty-one thousand, eight hundred eighty-five".