138112661 has 4 divisors (see below), whose sum is σ = 140174112. Its totient is φ = 136051212.

The previous prime is 138112651. The next prime is 138112669. The reversal of 138112661 is 166211831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138112661 - 2¹⁰ = 138111637 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 (138112669) 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, 1030625 + ... + 1030758.

It is an arithmetic number, because the mean of its divisors is an integer number (35043528).

Almost surely, 2^138112661 is an apocalyptic number.

It is an amenable number.

138112661 is a deficient number, since it is larger than the sum of its proper divisors (2061451).

138112661 is an equidigital number, since it uses as much as digits as its factorization.

138112661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061450.

The product of its digits is 1728, while the sum is 29.

The square root of 138112661 is about 11752.1343167954. The cubic root of 138112661 is about 516.9055132009.

The spelling of 138112661 in words is "one hundred thirty-eight million, one hundred twelve thousand, six hundred sixty-one".