31131121303201 has 4 divisors (see below), whose sum is σ = 31131452639232. Its totient is φ = 31130789967172.

The previous prime is 31131121303193. The next prime is 31131121303207. The reversal of 31131121303201 is 10230312113113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31131121303201 - 2³ = 31131121303193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131121303207) 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, 165527041 + ... + 165715006.

It is an arithmetic number, because the mean of its divisors is an integer number (7782863159808).

Almost surely, 2^{31131121303201} is an apocalyptic number.

It is an amenable number.

31131121303201 is a deficient number, since it is larger than the sum of its proper divisors (331336031).

31131121303201 is an equidigital number, since it uses as much as digits as its factorization.

31131121303201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331336030.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31131121303201 its reverse (10230312113113), we get a palindrome (41361433416314).

The spelling of 31131121303201 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred twenty-one million, three hundred three thousand, two hundred one".