138780601 has 4 divisors (see below), whose sum is σ = 139281892. Its totient is φ = 138279312.

The previous prime is 138780559. The next prime is 138780671. The reversal of 138780601 is 106087831.

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 6553600 + 132227001 = 2560^2 + 11499^2 .

It is a cyclic number.

It is not a de Polignac number, because 138780601 - 2¹⁷ = 138649529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138780671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250230 + ... + 250783.

It is an arithmetic number, because the mean of its divisors is an integer number (34820473).

Almost surely, 2^138780601 is an apocalyptic number.

It is an amenable number.

138780601 is a deficient number, since it is larger than the sum of its proper divisors (501291).

138780601 is an equidigital number, since it uses as much as digits as its factorization.

138780601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501290.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 138780601 is about 11780.5178578872. The cubic root of 138780601 is about 517.7374590724.

The spelling of 138780601 in words is "one hundred thirty-eight million, seven hundred eighty thousand, six hundred one".