31838438631 has 4 divisors (see below), whose sum is σ = 42451251512. Its totient is φ = 21225625752.

The previous prime is 31838438587. The next prime is 31838438651. The reversal of 31838438631 is 13683483813.

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

It is not a de Polignac number, because 31838438631 - 2¹¹ = 31838436583 is a prime.

It is a super-2 number, since 2×31838438631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31838438651) 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, 5306406436 + ... + 5306406441.

It is an arithmetic number, because the mean of its divisors is an integer number (10612812878).

Almost surely, 2^31838438631 is an apocalyptic number.

31838438631 is a deficient number, since it is larger than the sum of its proper divisors (10612812881).

31838438631 is a wasteful number, since it uses less digits than its factorization.

31838438631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10612812880.

The product of its digits is 995328, while the sum is 48.

The spelling of 31838438631 in words is "thirty-one billion, eight hundred thirty-eight million, four hundred thirty-eight thousand, six hundred thirty-one".