138857651 has 2 divisors, whose sum is σ = 138857652. Its totient is φ = 138857650.

The previous prime is 138857603. The next prime is 138857657. The reversal of 138857651 is 156758831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138857651 - 2¹⁸ = 138595507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138857657) 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, 69428825 + 69428826.

It is an arithmetic number, because the mean of its divisors is an integer number (69428826).

Almost surely, 2^138857651 is an apocalyptic number.

138857651 is a deficient number, since it is larger than the sum of its proper divisors (1).

138857651 is an equidigital number, since it uses as much as digits as its factorization.

138857651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 44.

The square root of 138857651 is about 11783.7876338637. The cubic root of 138857651 is about 517.8332560610.

The spelling of 138857651 in words is "one hundred thirty-eight million, eight hundred fifty-seven thousand, six hundred fifty-one".