138668101 has 16 divisors (see below), whose sum is σ = 163795968. Its totient is φ = 115732800.

The previous prime is 138668071. The next prime is 138668107. The reversal of 138668101 is 101866831.

It is a cyclic number.

It is not a de Polignac number, because 138668101 - 2²¹ = 136570949 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 (138668107) 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 15 ways as a sum of consecutive naturals, for example, 24775 + ... + 29851.

It is an arithmetic number, because the mean of its divisors is an integer number (10237248).

Almost surely, 2^138668101 is an apocalyptic number.

138668101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138668101 is a deficient number, since it is larger than the sum of its proper divisors (25127867).

138668101 is a wasteful number, since it uses less digits than its factorization.

138668101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5292.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 138668101 is about 11775.7420572973. The cubic root of 138668101 is about 517.5975230646.

The spelling of 138668101 in words is "one hundred thirty-eight million, six hundred sixty-eight thousand, one hundred one".