138556351 has 2 divisors, whose sum is σ = 138556352. Its totient is φ = 138556350.

The previous prime is 138556339. The next prime is 138556361. The reversal of 138556351 is 153655831.

138556351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138556351 - 2¹¹ = 138554303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138556351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138556361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69278175 + 69278176.

It is an arithmetic number, because the mean of its divisors is an integer number (69278176).

Almost surely, 2^138556351 is an apocalyptic number.

138556351 is a deficient number, since it is larger than the sum of its proper divisors (1).

138556351 is an equidigital number, since it uses as much as digits as its factorization.

138556351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 37.

The square root of 138556351 is about 11770.9961770447. The cubic root of 138556351 is about 517.4584450129.

The spelling of 138556351 in words is "one hundred thirty-eight million, five hundred fifty-six thousand, three hundred fifty-one".