123601138 has 4 divisors (see below), whose sum is σ = 185401710. Its totient is φ = 61800568.

The previous prime is 123601129. The next prime is 123601139. The reversal of 123601138 is 831106321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831106321 = 37 ⋅22462333.

It can be written as a sum of positive squares in only one way, i.e., 85322169 + 38278969 = 9237^2 + 6187^2 .

It is not an unprimeable number, because it can be changed into a prime (123601139) by changing a digit.

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 as a sum of consecutive naturals, namely, 30900283 + ... + 30900286.

Almost surely, 2^123601138 is an apocalyptic number.

123601138 is a deficient number, since it is larger than the sum of its proper divisors (61800572).

123601138 is an equidigital number, since it uses as much as digits as its factorization.

123601138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61800571.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 123601138 is about 11117.6048679560. The cubic root of 123601138 is about 498.1278495209.

Adding to 123601138 its reverse (831106321), we get a palindrome (954707459).

The spelling of 123601138 in words is "one hundred twenty-three million, six hundred one thousand, one hundred thirty-eight".