3131322121 has 4 divisors (see below), whose sum is σ = 3232332544. Its totient is φ = 3030311700.

The previous prime is 3131322119. The next prime is 3131322127. The reversal of 3131322121 is 1212231313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1212231313 = 977 ⋅1240769.

It is a cyclic number.

It is not a de Polignac number, because 3131322121 - 2¹ = 3131322119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131322127) 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, 50505165 + ... + 50505226.

It is an arithmetic number, because the mean of its divisors is an integer number (808083136).

Almost surely, 2^3131322121 is an apocalyptic number.

3131322121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3131322121 is a deficient number, since it is larger than the sum of its proper divisors (101010423).

3131322121 is a wasteful number, since it uses less digits than its factorization.

3131322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101010422.

The product of its digits is 216, while the sum is 19.

The square root of 3131322121 is about 55958.2176360184. The cubic root of 3131322121 is about 1462.9941246655.

Adding to 3131322121 its reverse (1212231313), we get a palindrome (4343553434).

The spelling of 3131322121 in words is "three billion, one hundred thirty-one million, three hundred twenty-two thousand, one hundred twenty-one".