31143003231 has 4 divisors (see below), whose sum is σ = 41524004312. Its totient is φ = 20762002152.

The previous prime is 31143003139. The next prime is 31143003247. The reversal of 31143003231 is 13230034113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13230034113 = 3 ⋅4410011371.

It is not a de Polignac number, because 31143003231 - 2¹⁰ = 31143002207 is a prime.

It is a super-2 number, since 2×31143003231² (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 = 31143003198 and 31143003207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143003251) 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, 5190500536 + ... + 5190500541.

It is an arithmetic number, because the mean of its divisors is an integer number (10381001078).

Almost surely, 2^31143003231 is an apocalyptic number.

31143003231 is a deficient number, since it is larger than the sum of its proper divisors (10381001081).

31143003231 is a wasteful number, since it uses less digits than its factorization.

31143003231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10381001080.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31143003231 its reverse (13230034113), we get a palindrome (44373037344).

The spelling of 31143003231 in words is "thirty-one billion, one hundred forty-three million, three thousand, two hundred thirty-one".