138686051 has 16 divisors (see below), whose sum is σ = 171730944. Its totient is φ = 109275264.

The previous prime is 138686039. The next prime is 138686069. The reversal of 138686051 is 150686831.

It is a happy number.

It is not a de Polignac number, because 138686051 - 2¹⁸ = 138423907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138685996 and 138686014.

It is not an unprimeable number, because it can be changed into a prime (138686081) 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, 8435 + ... + 18668.

It is an arithmetic number, because the mean of its divisors is an integer number (10733184).

Almost surely, 2^138686051 is an apocalyptic number.

138686051 is a deficient number, since it is larger than the sum of its proper divisors (33044893).

138686051 is a wasteful number, since it uses less digits than its factorization.

138686051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27170.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 138686051 is about 11776.5041926711. The cubic root of 138686051 is about 517.6198557054.

The spelling of 138686051 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, fifty-one".