139123001 has 4 divisors (see below), whose sum is σ = 140354292. Its totient is φ = 137891712.

The previous prime is 139122983. The next prime is 139123031. The reversal of 139123001 is 100321931.

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 74304400 + 64818601 = 8620^2 + 8051^2 .

It is a cyclic number.

It is not a de Polignac number, because 139123001 - 2⁶ = 139122937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139123031) 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 in 3 ways as a sum of consecutive naturals, for example, 615476 + ... + 615701.

It is an arithmetic number, because the mean of its divisors is an integer number (35088573).

Almost surely, 2^139123001 is an apocalyptic number.

It is an amenable number.

139123001 is a deficient number, since it is larger than the sum of its proper divisors (1231291).

139123001 is a wasteful number, since it uses less digits than its factorization.

139123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231290.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 139123001 is about 11795.0413733908. The cubic root of 139123001 is about 518.1628972927.

Adding to 139123001 its reverse (100321931), we get a palindrome (239444932).

The spelling of 139123001 in words is "one hundred thirty-nine million, one hundred twenty-three thousand, one".