138656651 has 8 divisors (see below), whose sum is σ = 158606304. Its totient is φ = 118742400.

The previous prime is 138656647. The next prime is 138656659. The reversal of 138656651 is 156656831.

138656651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138656651 - 2² = 138656647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138656599 and 138656608.

It is not an unprimeable number, because it can be changed into a prime (138656659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 16653.

It is an arithmetic number, because the mean of its divisors is an integer number (19825788).

Almost surely, 2^138656651 is an apocalyptic number.

138656651 is a deficient number, since it is larger than the sum of its proper divisors (19949653).

138656651 is a wasteful number, since it uses less digits than its factorization.

138656651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17701.

The product of its digits is 129600, while the sum is 41.

The square root of 138656651 is about 11775.2558783238. The cubic root of 138656651 is about 517.5832764457.

The spelling of 138656651 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, six hundred fifty-one".