138515901 has 16 divisors (see below), whose sum is σ = 190425600. Its totient is φ = 89494848.

The previous prime is 138515899. The next prime is 138515939. The reversal of 138515901 is 109515831.

It is not a de Polignac number, because 138515901 - 2¹ = 138515899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138515941) 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 15 ways as a sum of consecutive naturals, for example, 27540 + ... + 32178.

It is an arithmetic number, because the mean of its divisors is an integer number (11901600).

Almost surely, 2^138515901 is an apocalyptic number.

It is an amenable number.

138515901 is a deficient number, since it is larger than the sum of its proper divisors (51909699).

138515901 is a wasteful number, since it uses less digits than its factorization.

138515901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948.

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 138515901 is about 11769.2778453055. The cubic root of 138515901 is about 517.4080846814.

The spelling of 138515901 in words is "one hundred thirty-eight million, five hundred fifteen thousand, nine hundred one".