31550343131 has 2 divisors, whose sum is σ = 31550343132. Its totient is φ = 31550343130.

The previous prime is 31550343119. The next prime is 31550343157. The reversal of 31550343131 is 13134305513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31550343131 - 2¹⁰ = 31550342107 is a prime.

It is a super-2 number, since 2×31550343131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31550343094 and 31550343103.

It is not a weakly prime, because it can be changed into another prime (31550343731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15775171565 + 15775171566.

It is an arithmetic number, because the mean of its divisors is an integer number (15775171566).

Almost surely, 2^31550343131 is an apocalyptic number.

31550343131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31550343131 is an equidigital number, since it uses as much as digits as its factorization.

31550343131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 29.

Adding to 31550343131 its reverse (13134305513), we get a palindrome (44684648644).

The spelling of 31550343131 in words is "thirty-one billion, five hundred fifty million, three hundred forty-three thousand, one hundred thirty-one".