3131222330321 has 4 divisors (see below), whose sum is σ = 3133803718452. Its totient is φ = 3128640942192.

The previous prime is 3131222330317. The next prime is 3131222330329. The reversal of 3131222330321 is 1230332221313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1216211952400 + 1915010377921 = 1102820^2 + 1383839^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131222330321 - 2² = 3131222330317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3131222330329) 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, 1290692246 + ... + 1290694671.

It is an arithmetic number, because the mean of its divisors is an integer number (783450929613).

Almost surely, 2^{3131222330321} is an apocalyptic number.

It is an amenable number.

3131222330321 is a deficient number, since it is larger than the sum of its proper divisors (2581388131).

3131222330321 is a wasteful number, since it uses less digits than its factorization.

3131222330321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581388130.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 3131222330321 its reverse (1230332221313), we get a palindrome (4361554551634).

The spelling of 3131222330321 in words is "three trillion, one hundred thirty-one billion, two hundred twenty-two million, three hundred thirty thousand, three hundred twenty-one".