138202145 has 4 divisors (see below), whose sum is σ = 165842580. Its totient is φ = 110561712.

The previous prime is 138202133. The next prime is 138202151. The reversal of 138202145 is 541202831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541202831 = 13 ⋅41630987.

It can be written as a sum of positive squares in 2 ways, for example, as 27363361 + 110838784 = 5231^2 + 10528^2 .

It is a cyclic number.

It is not a de Polignac number, because 138202145 - 2¹⁰ = 138201121 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13820210 + ... + 13820219.

It is an arithmetic number, because the mean of its divisors is an integer number (41460645).

Almost surely, 2^138202145 is an apocalyptic number.

It is an amenable number.

138202145 is a deficient number, since it is larger than the sum of its proper divisors (27640435).

138202145 is an equidigital number, since it uses as much as digits as its factorization.

138202145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27640434.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 138202145 is about 11755.9408385718. The cubic root of 138202145 is about 517.0171244672.

Adding to 138202145 its reverse (541202831), we get a palindrome (679404976).

The spelling of 138202145 in words is "one hundred thirty-eight million, two hundred two thousand, one hundred forty-five".