138528451 has 2 divisors, whose sum is σ = 138528452. Its totient is φ = 138528450.

The previous prime is 138528443. The next prime is 138528521. The reversal of 138528451 is 154825831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138528451 - 2³ = 138528443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138528451.

It is not a weakly prime, because it can be changed into another prime (138528431) 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 as a sum of consecutive naturals, namely, 69264225 + 69264226.

It is an arithmetic number, because the mean of its divisors is an integer number (69264226).

Almost surely, 2^138528451 is an apocalyptic number.

138528451 is a deficient number, since it is larger than the sum of its proper divisors (1).

138528451 is an equidigital number, since it uses as much as digits as its factorization.

138528451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 37.

The square root of 138528451 is about 11769.8110010314. The cubic root of 138528451 is about 517.4237105056.

The spelling of 138528451 in words is "one hundred thirty-eight million, five hundred twenty-eight thousand, four hundred fifty-one".