31317281101 has 4 divisors (see below), whose sum is σ = 31317677500. Its totient is φ = 31316884704.

The previous prime is 31317281089. The next prime is 31317281113. The reversal of 31317281101 is 10118271313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10118271313 = 66107 ⋅153059.

It is an interprime number because it is at equal distance from previous prime (31317281089) and next prime (31317281113).

It can be written as a sum of positive squares in 2 ways, for example, as 16770509001 + 14546772100 = 129501^2 + 120610^2 .

It is a cyclic number.

It is not a de Polignac number, because 31317281101 - 2¹⁹ = 31316756813 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 31317281101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31317281131) 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, 34776 + ... + 252673.

It is an arithmetic number, because the mean of its divisors is an integer number (7829419375).

Almost surely, 2^31317281101 is an apocalyptic number.

It is an amenable number.

31317281101 is a deficient number, since it is larger than the sum of its proper divisors (396399).

31317281101 is a wasteful number, since it uses less digits than its factorization.

31317281101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396398.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 31317281101 in words is "thirty-one billion, three hundred seventeen million, two hundred eighty-one thousand, one hundred one".