31311121310201 has 4 divisors (see below), whose sum is σ = 31311132710052. Its totient is φ = 31311109910352.

The previous prime is 31311121310171. The next prime is 31311121310213. The reversal of 31311121310201 is 10201312111313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21019703325625 + 10291417984576 = 4584725^2 + 3208024^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311121310201 - 2¹⁸ = 31311121048057 is a prime.

It is a super-3 number, since 3×31311121310201³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311121310801) 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, 1221911 + ... + 8007203.

It is an arithmetic number, because the mean of its divisors is an integer number (7827783177513).

Almost surely, 2^{31311121310201} is an apocalyptic number.

It is an amenable number.

31311121310201 is a deficient number, since it is larger than the sum of its proper divisors (11399851).

31311121310201 is an equidigital number, since it uses as much as digits as its factorization.

31311121310201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399850.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31311121310201 its reverse (10201312111313), we get a palindrome (41512433421514).

The spelling of 31311121310201 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-one million, three hundred ten thousand, two hundred one".