31610442381 has 24 divisors (see below), whose sum is σ = 50168647584. Its totient is φ = 17643034080.

The previous prime is 31610442361. The next prime is 31610442389. The reversal of 31610442381 is 18324401613.

It is not a de Polignac number, because 31610442381 - 2⁶ = 31610442317 is a prime.

It is a super-4 number, since 4×31610442381⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31610442389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2494110 + ... + 2506751.

It is an arithmetic number, because the mean of its divisors is an integer number (2090360316).

Almost surely, 2^31610442381 is an apocalyptic number.

It is an amenable number.

31610442381 is a deficient number, since it is larger than the sum of its proper divisors (18558205203).

31610442381 is a wasteful number, since it uses less digits than its factorization.

31610442381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000921 (or 5000914 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

Adding to 31610442381 its reverse (18324401613), we get a palindrome (49934843994).

The spelling of 31610442381 in words is "thirty-one billion, six hundred ten million, four hundred forty-two thousand, three hundred eighty-one".