31131303109 has 2 divisors, whose sum is σ = 31131303110. Its totient is φ = 31131303108.

The previous prime is 31131303107. The next prime is 31131303143. The reversal of 31131303109 is 90130313113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21419200609 + 9712102500 = 146353^2 + 98550^2 .

It is a cyclic number.

It is not a de Polignac number, because 31131303109 - 2¹ = 31131303107 is a prime.

Together with 31131303107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31131303107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565651554 + 15565651555.

It is an arithmetic number, because the mean of its divisors is an integer number (15565651555).

Almost surely, 2^31131303109 is an apocalyptic number.

It is an amenable number.

31131303109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131303109 is an equidigital number, since it uses as much as digits as its factorization.

31131303109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 25.

The spelling of 31131303109 in words is "thirty-one billion, one hundred thirty-one million, three hundred three thousand, one hundred nine".