123451849 has 4 divisors (see below), whose sum is σ = 123474964. Its totient is φ = 123428736.

The previous prime is 123451847. The next prime is 123451859. The reversal of 123451849 is 948154321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948154321 = 19 ⋅49902859.

It can be written as a sum of positive squares in 2 ways, for example, as 61152400 + 62299449 = 7820^2 + 7893^2 .

It is a cyclic number.

It is not a de Polignac number, because 123451849 - 2¹ = 123451847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123451847) 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, 1009 + ... + 15745.

It is an arithmetic number, because the mean of its divisors is an integer number (30868741).

Almost surely, 2^123451849 is an apocalyptic number.

It is an amenable number.

123451849 is a deficient number, since it is larger than the sum of its proper divisors (23115).

123451849 is an equidigital number, since it uses as much as digits as its factorization.

123451849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23114.

The product of its digits is 34560, while the sum is 37.

The square root of 123451849 is about 11110.8887583307. Note that the first 3 decimals coincide. The cubic root of 123451849 is about 497.9272176877.

The spelling of 123451849 in words is "one hundred twenty-three million, four hundred fifty-one thousand, eight hundred forty-nine".