138771481 has 8 divisors (see below), whose sum is σ = 141753600. Its totient is φ = 135810480.

The previous prime is 138771473. The next prime is 138771487. The reversal of 138771481 is 184177831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138771481 - 2³ = 138771473 is a prime.

It is a super-2 number, since 2×138771481² = 38515047877866722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138771487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8376 + ... + 18646.

It is an arithmetic number, because the mean of its divisors is an integer number (17719200).

Almost surely, 2^138771481 is an apocalyptic number.

It is an amenable number.

138771481 is a deficient number, since it is larger than the sum of its proper divisors (2982119).

138771481 is a wasteful number, since it uses less digits than its factorization.

138771481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10559.

The product of its digits is 37632, while the sum is 40.

The square root of 138771481 is about 11780.1307717699. The cubic root of 138771481 is about 517.7261177441.

The spelling of 138771481 in words is "one hundred thirty-eight million, seven hundred seventy-one thousand, four hundred eighty-one".