31211343133 has 8 divisors (see below), whose sum is σ = 31330734552. Its totient is φ = 31092000576.

The previous prime is 31211343109. The next prime is 31211343139. The reversal of 31211343133 is 33134311213.

It can be written as a sum of positive squares in 4 ways, for example, as 5424764409 + 25786578724 = 73653^2 + 160582^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31211343133 - 2¹⁷ = 31211212061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31211343098 and 31211343107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211343139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740891 + ... + 1758727.

It is an arithmetic number, because the mean of its divisors is an integer number (3916341819).

Almost surely, 2^31211343133 is an apocalyptic number.

It is an amenable number.

31211343133 is a deficient number, since it is larger than the sum of its proper divisors (119391419).

31211343133 is a wasteful number, since it uses less digits than its factorization.

31211343133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24431.

The product of its digits is 1944, while the sum is 25.

Adding to 31211343133 its reverse (33134311213), we get a palindrome (64345654346).

The spelling of 31211343133 in words is "thirty-one billion, two hundred eleven million, three hundred forty-three thousand, one hundred thirty-three".