138151649 has 2 divisors, whose sum is σ = 138151650. Its totient is φ = 138151648.

The previous prime is 138151631. The next prime is 138151661. The reversal of 138151649 is 946151831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120846049 + 17305600 = 10993^2 + 4160^2 .

It is an emirp because it is prime and its reverse (946151831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138151649 - 2⁸ = 138151393 is a prime.

It is equal to p_7813568 and since 138151649 and 7813568 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138151609) 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, 69075824 + 69075825.

It is an arithmetic number, because the mean of its divisors is an integer number (69075825).

Almost surely, 2^138151649 is an apocalyptic number.

It is an amenable number.

138151649 is a deficient number, since it is larger than the sum of its proper divisors (1).

138151649 is an equidigital number, since it uses as much as digits as its factorization.

138151649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 138151649 is about 11753.7929622739. The cubic root of 138151649 is about 516.9541479313.

The spelling of 138151649 in words is "one hundred thirty-eight million, one hundred fifty-one thousand, six hundred forty-nine".