138372571 has 4 divisors (see below), whose sum is σ = 146512152. Its totient is φ = 130232992.

The previous prime is 138372551. The next prime is 138372587. The reversal of 138372571 is 175273831.

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 138372571 - 2²³ = 129983963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138372571.

It is not an unprimeable number, because it can be changed into a prime (138372551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4069765 + ... + 4069798.

It is an arithmetic number, because the mean of its divisors is an integer number (36628038).

Almost surely, 2^138372571 is an apocalyptic number.

138372571 is a deficient number, since it is larger than the sum of its proper divisors (8139581).

138372571 is an equidigital number, since it uses as much as digits as its factorization.

138372571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8139580.

The product of its digits is 35280, while the sum is 37.

The square root of 138372571 is about 11763.1871106431. The cubic root of 138372571 is about 517.2295595827.

The spelling of 138372571 in words is "one hundred thirty-eight million, three hundred seventy-two thousand, five hundred seventy-one".