31143204243 has 20 divisors (see below), whose sum is σ = 46601089128. Its totient is φ = 20727092160.

The previous prime is 31143204233. The next prime is 31143204271. The reversal of 31143204243 is 34240234113.

31143204243 is a `hidden beast` number, since 311 + 4 + 320 + 4 + 24 + 3 = 666.

It is not a de Polignac number, because 31143204243 - 2⁹ = 31143203731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31143204203) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 276153 + ... + 372218.

Almost surely, 2^31143204243 is an apocalyptic number.

31143204243 is a deficient number, since it is larger than the sum of its proper divisors (15457884885).

31143204243 is an equidigital number, since it uses as much as digits as its factorization.

31143204243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648976 (or 648967 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31143204243 its reverse (34240234113), we get a palindrome (65383438356).

The spelling of 31143204243 in words is "thirty-one billion, one hundred forty-three million, two hundred four thousand, two hundred forty-three".