31231122101 has 4 divisors (see below), whose sum is σ = 31239429804. Its totient is φ = 31222814400.

The previous prime is 31231122077. The next prime is 31231122113. The reversal of 31231122101 is 10122113213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19103386225 + 12127735876 = 138215^2 + 110126^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231122101 - 2³⁰ = 30157380277 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 31231122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231122151) 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, 4148210 + ... + 4155731.

It is an arithmetic number, because the mean of its divisors is an integer number (7809857451).

Almost surely, 2^31231122101 is an apocalyptic number.

It is an amenable number.

31231122101 is a deficient number, since it is larger than the sum of its proper divisors (8307703).

31231122101 is an equidigital number, since it uses as much as digits as its factorization.

31231122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8307702.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31231122101 its reverse (10122113213), we get a palindrome (41353235314).

It can be divided in two parts, 3123112 and 2101, that added together give a palindrome (3125213).

The spelling of 31231122101 in words is "thirty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred one".