31311330133 has 4 divisors (see below), whose sum is σ = 33153173100. Its totient is φ = 29469487168.

The previous prime is 31311330109. The next prime is 31311330143. The reversal of 31311330133 is 33103311313.

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 27766556689 + 3544773444 = 166633^2 + 59538^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311330133 - 2¹³ = 31311321941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311330143) 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, 920921458 + ... + 920921491.

It is an arithmetic number, because the mean of its divisors is an integer number (8288293275).

Almost surely, 2^31311330133 is an apocalyptic number.

It is an amenable number.

31311330133 is a deficient number, since it is larger than the sum of its proper divisors (1841842967).

31311330133 is a wasteful number, since it uses less digits than its factorization.

31311330133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841842966.

The product of its (nonzero) digits is 729, while the sum is 22.

Adding to 31311330133 its reverse (33103311313), we get a palindrome (64414641446).

The spelling of 31311330133 in words is "thirty-one billion, three hundred eleven million, three hundred thirty thousand, one hundred thirty-three".