3131123031321 has 4 divisors (see below), whose sum is σ = 4174830708432. Its totient is φ = 2087415354212.

The previous prime is 3131123031313. The next prime is 3131123031349. The reversal of 3131123031321 is 1231303211313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3131123031321 - 2³ = 3131123031313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131123031291 and 3131123031300.

It is not an unprimeable number, because it can be changed into a prime (3131123031521) 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, 521853838551 + ... + 521853838556.

It is an arithmetic number, because the mean of its divisors is an integer number (1043707677108).

Almost surely, 2^{3131123031321} is an apocalyptic number.

It is an amenable number.

3131123031321 is a deficient number, since it is larger than the sum of its proper divisors (1043707677111).

3131123031321 is a wasteful number, since it uses less digits than its factorization.

3131123031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043707677110.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 3131123031321 its reverse (1231303211313), we get a palindrome (4362426242634).

It can be divided in two parts, 313112 and 3031321, that added together give a palindrome (3344433).

The spelling of 3131123031321 in words is "three trillion, one hundred thirty-one billion, one hundred twenty-three million, thirty-one thousand, three hundred twenty-one".