138481031 has 8 divisors (see below), whose sum is σ = 157906224. Its totient is φ = 120309120.

The previous prime is 138481001. The next prime is 138481033. The reversal of 138481031 is 130184831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138481031 is a prime.

It is a super-2 number, since 2×138481031² = 38353991893645922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138480985 and 138481003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138481033) 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, 313085 + ... + 313526.

It is an arithmetic number, because the mean of its divisors is an integer number (19738278).

Almost surely, 2^138481031 is an apocalyptic number.

138481031 is a deficient number, since it is larger than the sum of its proper divisors (19425193).

138481031 is a wasteful number, since it uses less digits than its factorization.

138481031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626641.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 138481031 is about 11767.7963527587. The cubic root of 138481031 is about 517.3646635917.

The spelling of 138481031 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, thirty-one".