31103321131 has 4 divisors (see below), whose sum is σ = 31124155392. Its totient is φ = 31082486872.

The previous prime is 31103321089. The next prime is 31103321143. The reversal of 31103321131 is 13112330113.

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

It is a cyclic number.

It is not a de Polignac number, because 31103321131 - 2⁷ = 31103321003 is a prime.

It is a super-2 number, since 2×31103321131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103321099 and 31103321108.

It is not an unprimeable number, because it can be changed into a prime (31103351131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10414891 + ... + 10417876.

It is an arithmetic number, because the mean of its divisors is an integer number (7781038848).

Almost surely, 2^31103321131 is an apocalyptic number.

31103321131 is a deficient number, since it is larger than the sum of its proper divisors (20834261).

31103321131 is a wasteful number, since it uses less digits than its factorization.

31103321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20834260.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31103321131 its reverse (13112330113), we get a palindrome (44215651244).

The spelling of 31103321131 in words is "thirty-one billion, one hundred three million, three hundred twenty-one thousand, one hundred thirty-one".