138445571 has 16 divisors (see below), whose sum is σ = 159719040. Its totient is φ = 118681920.

The previous prime is 138445553. The next prime is 138445591. The reversal of 138445571 is 175544831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138445571 is a prime.

It is a super-2 number, since 2×138445571² = 38334352259032082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138445511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47276 + ... + 50118.

It is an arithmetic number, because the mean of its divisors is an integer number (9982440).

Almost surely, 2^138445571 is an apocalyptic number.

138445571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138445571 is a deficient number, since it is larger than the sum of its proper divisors (21273469).

138445571 is a wasteful number, since it uses less digits than its factorization.

138445571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106.

The product of its digits is 67200, while the sum is 38.

The square root of 138445571 is about 11766.2896020793. The cubic root of 138445571 is about 517.3205003419.

The spelling of 138445571 in words is "one hundred thirty-eight million, four hundred forty-five thousand, five hundred seventy-one".