31143203323 has 4 divisors (see below), whose sum is σ = 31165029000. Its totient is φ = 31121377648.

The previous prime is 31143203317. The next prime is 31143203339. The reversal of 31143203323 is 32330234113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31143203323 - 2¹⁷ = 31143072251 is a prime.

It is a super-2 number, since 2×31143203323² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31143203393) 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, 10910698 + ... + 10913551.

It is an arithmetic number, because the mean of its divisors is an integer number (7791257250).

Almost surely, 2^31143203323 is an apocalyptic number.

31143203323 is a deficient number, since it is larger than the sum of its proper divisors (21825677).

31143203323 is a wasteful number, since it uses less digits than its factorization.

31143203323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21825676.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 31143203323 its reverse (32330234113), we get a palindrome (63473437436).

The spelling of 31143203323 in words is "thirty-one billion, one hundred forty-three million, two hundred three thousand, three hundred twenty-three".