138703031 has 4 divisors (see below), whose sum is σ = 138760200. Its totient is φ = 138645864.

The previous prime is 138703003. The next prime is 138703049. The reversal of 138703031 is 130307831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138703031 is a prime.

It is a super-3 number, since 3×138703031³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138703091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24776 + ... + 29853.

It is an arithmetic number, because the mean of its divisors is an integer number (34690050).

Almost surely, 2^138703031 is an apocalyptic number.

138703031 is a deficient number, since it is larger than the sum of its proper divisors (57169).

138703031 is an equidigital number, since it uses as much as digits as its factorization.

138703031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57168.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 138703031 is about 11777.2250976196. The cubic root of 138703031 is about 517.6409797392.

The spelling of 138703031 in words is "one hundred thirty-eight million, seven hundred three thousand, thirty-one".