31231113101 has 4 divisors (see below), whose sum is σ = 31232266812. Its totient is φ = 31229959392.

The previous prime is 31231113079. The next prime is 31231113107. The reversal of 31231113101 is 10131113213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10131113213 = 13 ⋅779316401.

It can be written as a sum of positive squares in 2 ways, for example, as 19383879076 + 11847234025 = 139226^2 + 108845^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231113101 - 2²⁶ = 31164004237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31231113101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231113107) 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, 535250 + ... + 590723.

It is an arithmetic number, because the mean of its divisors is an integer number (7808066703).

Almost surely, 2^31231113101 is an apocalyptic number.

It is an amenable number.

31231113101 is a deficient number, since it is larger than the sum of its proper divisors (1153711).

31231113101 is a wasteful number, since it uses less digits than its factorization.

31231113101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153710.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31231113101 its reverse (10131113213), we get a palindrome (41362226314).

The spelling of 31231113101 in words is "thirty-one billion, two hundred thirty-one million, one hundred thirteen thousand, one hundred one".