31323100243 has 2 divisors, whose sum is σ = 31323100244. Its totient is φ = 31323100242.

The previous prime is 31323100189. The next prime is 31323100261. The reversal of 31323100243 is 34200132313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31323100243 - 2¹³ = 31323092051 is a prime.

It is a super-2 number, since 2×31323100243² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31323100043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661550121 + 15661550122.

It is an arithmetic number, because the mean of its divisors is an integer number (15661550122).

Almost surely, 2^31323100243 is an apocalyptic number.

31323100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323100243 is an equidigital number, since it uses as much as digits as its factorization.

31323100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31323100243 its reverse (34200132313), we get a palindrome (65523232556).

The spelling of 31323100243 in words is "thirty-one billion, three hundred twenty-three million, one hundred thousand, two hundred forty-three".