138562253 has 4 divisors (see below), whose sum is σ = 138649980. Its totient is φ = 138474528.

The previous prime is 138562243. The next prime is 138562271. The reversal of 138562253 is 352265831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352265831 = 17203 ⋅20477.

It can be written as a sum of positive squares in 2 ways, for example, as 59938564 + 78623689 = 7742^2 + 8867^2 .

It is a cyclic number.

It is not a de Polignac number, because 138562253 - 2¹⁰ = 138561229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138562213) by changing a digit.

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, 41450 + ... + 44667.

It is an arithmetic number, because the mean of its divisors is an integer number (34662495).

Almost surely, 2^138562253 is an apocalyptic number.

It is an amenable number.

138562253 is a deficient number, since it is larger than the sum of its proper divisors (87727).

138562253 is an equidigital number, since it uses as much as digits as its factorization.

138562253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87726.

The product of its digits is 43200, while the sum is 35.

The square root of 138562253 is about 11771.2468753314. The cubic root of 138562253 is about 517.4657921953.

The spelling of 138562253 in words is "one hundred thirty-eight million, five hundred sixty-two thousand, two hundred fifty-three".