31201212323 has 4 divisors (see below), whose sum is σ = 31201861320. Its totient is φ = 31200563328.

The previous prime is 31201212271. The next prime is 31201212331. The reversal of 31201212323 is 32321210213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32321210213 = 19 ⋅1701116327.

It is a cyclic number.

It is not a de Polignac number, because 31201212323 - 2²⁶ = 31134103459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201212295 and 31201212304.

It is not an unprimeable number, because it can be changed into a prime (31201212923) 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, 246065 + ... + 350642.

It is an arithmetic number, because the mean of its divisors is an integer number (7800465330).

Almost surely, 2^31201212323 is an apocalyptic number.

31201212323 is a deficient number, since it is larger than the sum of its proper divisors (648997).

31201212323 is an equidigital number, since it uses as much as digits as its factorization.

31201212323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648996.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31201212323 its reverse (32321210213), we get a palindrome (63522422536).

The spelling of 31201212323 in words is "thirty-one billion, two hundred one million, two hundred twelve thousand, three hundred twenty-three".