31355438139 has 6 divisors (see below), whose sum is σ = 45291188436. Its totient is φ = 20903625420.

The previous prime is 31355438099. The next prime is 31355438141. The reversal of 31355438139 is 93183455313.

31355438139 is a `hidden beast` number, since 3 + 13 + 554 + 3 + 81 + 3 + 9 = 666.

It is not a de Polignac number, because 31355438139 - 2⁷ = 31355438011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31355438094 and 31355438103.

It is not an unprimeable number, because it can be changed into a prime (31355433139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1741968777 + ... + 1741968794.

It is an arithmetic number, because the mean of its divisors is an integer number (7548531406).

Almost surely, 2^31355438139 is an apocalyptic number.

31355438139 is a deficient number, since it is larger than the sum of its proper divisors (13935750297).

31355438139 is a wasteful number, since it uses less digits than its factorization.

31355438139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483937577 (or 3483937574 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The spelling of 31355438139 in words is "thirty-one billion, three hundred fifty-five million, four hundred thirty-eight thousand, one hundred thirty-nine".