138198101 has 4 divisors (see below), whose sum is σ = 138225600. Its totient is φ = 138170604.

The previous prime is 138198091. The next prime is 138198107. The reversal of 138198101 is 101891831.

138198101 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101891831 = 1103 ⋅92377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138198101 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 (138198107) 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, 3821 + ... + 17058.

It is an arithmetic number, because the mean of its divisors is an integer number (34556400).

Almost surely, 2^138198101 is an apocalyptic number.

It is an amenable number.

138198101 is a deficient number, since it is larger than the sum of its proper divisors (27499).

138198101 is an equidigital number, since it uses as much as digits as its factorization.

138198101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27498.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 138198101 is about 11755.7688391700. The cubic root of 138198101 is about 517.0120815218.

The spelling of 138198101 in words is "one hundred thirty-eight million, one hundred ninety-eight thousand, one hundred one".