31311320303201 has 4 divisors (see below), whose sum is σ = 31315604250900. Its totient is φ = 31307036355504.

The previous prime is 31311320303183. The next prime is 31311320303261. The reversal of 31311320303201 is 10230302311313.

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 7361806960225 + 23949513342976 = 2713265^2 + 4893824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311320303201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311320303261) 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, 2141962886 + ... + 2141977503.

It is an arithmetic number, because the mean of its divisors is an integer number (7828901062725).

Almost surely, 2^{31311320303201} is an apocalyptic number.

It is an amenable number.

31311320303201 is a deficient number, since it is larger than the sum of its proper divisors (4283947699).

31311320303201 is an equidigital number, since it uses as much as digits as its factorization.

31311320303201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283947698.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31311320303201 its reverse (10230302311313), we get a palindrome (41541622614514).

The spelling of 31311320303201 in words is "thirty-one trillion, three hundred eleven billion, three hundred twenty million, three hundred three thousand, two hundred one".