31143112031 has 4 divisors (see below), whose sum is σ = 31334174232. Its totient is φ = 30952049832.

The previous prime is 31143112003. The next prime is 31143112043. The reversal of 31143112031 is 13021134113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13021134113 = 13 ⋅1001625701.

It is a cyclic number.

It is not a de Polignac number, because 31143112031 - 2¹⁸ = 31142849887 is a prime.

It is a super-2 number, since 2×31143112031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31143111994 and 31143112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143112331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95530856 + ... + 95531181.

It is an arithmetic number, because the mean of its divisors is an integer number (7833543558).

Almost surely, 2^31143112031 is an apocalyptic number.

31143112031 is a deficient number, since it is larger than the sum of its proper divisors (191062201).

31143112031 is a wasteful number, since it uses less digits than its factorization.

31143112031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191062200.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31143112031 its reverse (13021134113), we get a palindrome (44164246144).

The spelling of 31143112031 in words is "thirty-one billion, one hundred forty-three million, one hundred twelve thousand, thirty-one".