138247201 has 4 divisors (see below), whose sum is σ = 138442900. Its totient is φ = 138051504.

The previous prime is 138247199. The next prime is 138247237. The reversal of 138247201 is 102742831.

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 8856576 + 129390625 = 2976^2 + 11375^2 .

It is a cyclic number.

It is not a de Polignac number, because 138247201 - 2¹ = 138247199 is a prime.

It is a super-2 number, since 2×138247201² = 38224577168668802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138247201.

It is not an unprimeable number, because it can be changed into a prime (138247271) 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, 96786 + ... + 98203.

It is an arithmetic number, because the mean of its divisors is an integer number (34610725).

Almost surely, 2^138247201 is an apocalyptic number.

It is an amenable number.

138247201 is a deficient number, since it is larger than the sum of its proper divisors (195699).

138247201 is an equidigital number, since it uses as much as digits as its factorization.

138247201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195698.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 138247201 is about 11757.8569901152. The cubic root of 138247201 is about 517.0733035098.

It can be divided in two parts, 13824 and 7201, that added together give a square (21025 = 145²).

The spelling of 138247201 in words is "one hundred thirty-eight million, two hundred forty-seven thousand, two hundred one".