138671651 has 2 divisors, whose sum is σ = 138671652. Its totient is φ = 138671650.

The previous prime is 138671647. The next prime is 138671677. The reversal of 138671651 is 156176831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138671651 - 2² = 138671647 is a prime.

It is not a weakly prime, because it can be changed into another prime (138671051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69335825 + 69335826.

It is an arithmetic number, because the mean of its divisors is an integer number (69335826).

Almost surely, 2^138671651 is an apocalyptic number.

138671651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138671651 is an equidigital number, since it uses as much as digits as its factorization.

138671651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 138671651 is about 11775.8927899332. The cubic root of 138671651 is about 517.6019399793.

It can be divided in two parts, 1386 and 71651, that added together give a palindrome (73037).

The spelling of 138671651 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, six hundred fifty-one".