31131023220001 has 4 divisors (see below), whose sum is σ = 31421967362352. Its totient is φ = 30840079077652.

The previous prime is 31131023219993. The next prime is 31131023220013. The reversal of 31131023220001 is 10002232013113.

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 31131023220001 - 2³ = 31131023219993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131023200001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145472071015 + ... + 145472071228.

It is an arithmetic number, because the mean of its divisors is an integer number (7855491840588).

Almost surely, 2^{31131023220001} is an apocalyptic number.

It is an amenable number.

31131023220001 is a deficient number, since it is larger than the sum of its proper divisors (290944142351).

31131023220001 is a wasteful number, since it uses less digits than its factorization.

31131023220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290944142350.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31131023220001 its reverse (10002232013113), we get a palindrome (41133255233114).

The spelling of 31131023220001 in words is "thirty-one trillion, one hundred thirty-one billion, twenty-three million, two hundred twenty thousand, one".