138255653 has 4 divisors (see below), whose sum is σ = 138747948. Its totient is φ = 137763360.

The previous prime is 138255619. The next prime is 138255671. The reversal of 138255653 is 356552831.

138255653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 86731969 + 51523684 = 9313^2 + 7178^2 .

It is a cyclic number.

It is not a de Polignac number, because 138255653 - 2¹² = 138251557 is a prime.

It is a super-2 number, since 2×138255653² = 38229251172912818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255683) 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, 245726 + ... + 246287.

It is an arithmetic number, because the mean of its divisors is an integer number (34686987).

Almost surely, 2^138255653 is an apocalyptic number.

It is an amenable number.

138255653 is a deficient number, since it is larger than the sum of its proper divisors (492295).

138255653 is an equidigital number, since it uses as much as digits as its factorization.

138255653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492294.

The product of its digits is 108000, while the sum is 38.

The square root of 138255653 is about 11758.2164038599. The cubic root of 138255653 is about 517.0838407080.

The spelling of 138255653 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, six hundred fifty-three".