138538651 has 2 divisors, whose sum is σ = 138538652. Its totient is φ = 138538650.

The previous prime is 138538649. The next prime is 138538663. The reversal of 138538651 is 156835831.

138538651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (156835831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138538651 - 2¹ = 138538649 is a prime.

Together with 138538649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138538051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69269325 + 69269326.

It is an arithmetic number, because the mean of its divisors is an integer number (69269326).

Almost surely, 2^138538651 is an apocalyptic number.

138538651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138538651 is an equidigital number, since it uses as much as digits as its factorization.

138538651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 138538651 is about 11770.2443050261. The cubic root of 138538651 is about 517.4364096835.

The spelling of 138538651 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, six hundred fifty-one".