31231121130311 has 4 divisors (see below), whose sum is σ = 31231135416624. Its totient is φ = 31231106844000.

The previous prime is 31231121130283. The next prime is 31231121130317. The reversal of 31231121130311 is 11303112113213.

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 31231121130311 - 2⁶ = 31231121130247 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 (31231121130317) 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, 3101915 + ... + 8490236.

It is an arithmetic number, because the mean of its divisors is an integer number (7807783854156).

Almost surely, 2^{31231121130311} is an apocalyptic number.

31231121130311 is a deficient number, since it is larger than the sum of its proper divisors (14286313).

31231121130311 is a wasteful number, since it uses less digits than its factorization.

31231121130311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14286312.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 31231121130311 its reverse (11303112113213), we get a palindrome (42534233243524).

The spelling of 31231121130311 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-one million, one hundred thirty thousand, three hundred eleven".