31131332101 has 4 divisors (see below), whose sum is σ = 31132096704. Its totient is φ = 31130567500.

The previous prime is 31131332083. The next prime is 31131332149. The reversal of 31131332101 is 10123313113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10123313113 = 503 ⋅20125871.

It is a cyclic number.

It is not a de Polignac number, because 31131332101 - 2⁵ = 31131332069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131332191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317575 + ... + 403876.

It is an arithmetic number, because the mean of its divisors is an integer number (7783024176).

Almost surely, 2^31131332101 is an apocalyptic number.

It is an amenable number.

31131332101 is a deficient number, since it is larger than the sum of its proper divisors (764603).

31131332101 is an equidigital number, since it uses as much as digits as its factorization.

31131332101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764602.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31131332101 its reverse (10123313113), we get a palindrome (41254645214).

The spelling of 31131332101 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty-two thousand, one hundred one".