31283112131781 has 8 divisors (see below), whose sum is σ = 41711195567520. Its totient is φ = 20855218391952.

The previous prime is 31283112131767. The next prime is 31283112131819. The reversal of 31283112131781 is 18713121138213.

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

It is not a de Polignac number, because 31283112131781 - 2¹⁸ = 31283111869637 is a prime.

It is a super-2 number, since 2×31283112131781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31283112131881) 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, 47038735 + ... + 47699148.

It is an arithmetic number, because the mean of its divisors is an integer number (5213899445940).

Almost surely, 2^{31283112131781} is an apocalyptic number.

It is an amenable number.

31283112131781 is a deficient number, since it is larger than the sum of its proper divisors (10428083435739).

31283112131781 is a wasteful number, since it uses less digits than its factorization.

31283112131781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94847955.

The product of its digits is 48384, while the sum is 42.

Adding to 31283112131781 its reverse (18713121138213), we get a palindrome (49996233269994).

The spelling of 31283112131781 in words is "thirty-one trillion, two hundred eighty-three billion, one hundred twelve million, one hundred thirty-one thousand, seven hundred eighty-one".