138630571 has 4 divisors (see below), whose sum is σ = 140699752. Its totient is φ = 136561392.

The previous prime is 138630551. The next prime is 138630599. The reversal of 138630571 is 175036831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138630571 - 2⁵ = 138630539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138630521) 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 in 3 ways as a sum of consecutive naturals, for example, 1034490 + ... + 1034623.

It is an arithmetic number, because the mean of its divisors is an integer number (35174938).

Almost surely, 2^138630571 is an apocalyptic number.

138630571 is a deficient number, since it is larger than the sum of its proper divisors (2069181).

138630571 is an equidigital number, since it uses as much as digits as its factorization.

138630571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069180.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 138630571 is about 11774.1484193125. The cubic root of 138630571 is about 517.5508235770.

The spelling of 138630571 in words is "one hundred thirty-eight million, six hundred thirty thousand, five hundred seventy-one".