31201023313105 has 4 divisors (see below), whose sum is σ = 37441227975732. Its totient is φ = 24960818650480.

The previous prime is 31201023313087. The next prime is 31201023313123. The reversal of 31201023313105 is 50131332010213.

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

It is an interprime number because it is at equal distance from previous prime (31201023313087) and next prime (31201023313123).

It can be written as a sum of positive squares in 2 ways, for example, as 22994671916176 + 8206351396929 = 4795276^2 + 2864673^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31201023313105 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 31201023313105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3120102331306 + ... + 3120102331315.

It is an arithmetic number, because the mean of its divisors is an integer number (9360306993933).

Almost surely, 2^{31201023313105} is an apocalyptic number.

It is an amenable number.

31201023313105 is a deficient number, since it is larger than the sum of its proper divisors (6240204662627).

31201023313105 is an equidigital number, since it uses as much as digits as its factorization.

31201023313105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240204662626.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 31201023313105 its reverse (50131332010213), we get a palindrome (81332355323318).

The spelling of 31201023313105 in words is "thirty-one trillion, two hundred one billion, twenty-three million, three hundred thirteen thousand, one hundred five".