123601139 has 2 divisors, whose sum is σ = 123601140. Its totient is φ = 123601138.

The previous prime is 123601129. The next prime is 123601199. The reversal of 123601139 is 931106321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123601139 is a prime.

It is not a weakly prime, because it can be changed into another prime (123601129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61800569 + 61800570.

It is an arithmetic number, because the mean of its divisors is an integer number (61800570).

Almost surely, 2^123601139 is an apocalyptic number.

123601139 is a deficient number, since it is larger than the sum of its proper divisors (1).

123601139 is an equidigital number, since it uses as much as digits as its factorization.

123601139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 123601139 is about 11117.6049129298. The cubic root of 123601139 is about 498.1278508643.

The spelling of 123601139 in words is "one hundred twenty-three million, six hundred one thousand, one hundred thirty-nine".