31311332331011 has 4 divisors (see below), whose sum is σ = 31315689000552. Its totient is φ = 31306975661472.

The previous prime is 31311332330963. The next prime is 31311332331029. The reversal of 31311332331011 is 11013323311313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311332331011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311332331091) 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, 2178323990 + ... + 2178338363.

It is an arithmetic number, because the mean of its divisors is an integer number (7828922250138).

Almost surely, 2^{31311332331011} is an apocalyptic number.

31311332331011 is a deficient number, since it is larger than the sum of its proper divisors (4356669541).

31311332331011 is an equidigital number, since it uses as much as digits as its factorization.

31311332331011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356669540.

The product of its (nonzero) digits is 1458, while the sum is 26.

Adding to 31311332331011 its reverse (11013323311313), we get a palindrome (42324655642324).

The spelling of 31311332331011 in words is "thirty-one trillion, three hundred eleven billion, three hundred thirty-two million, three hundred thirty-one thousand, eleven".