31123303109 has 2 divisors, whose sum is σ = 31123303110. Its totient is φ = 31123303108.

The previous prime is 31123303103. The next prime is 31123303147. The reversal of 31123303109 is 90130332113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31099322500 + 23980609 = 176350^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123303109 - 2⁸ = 31123302853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123303103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561651554 + 15561651555.

It is an arithmetic number, because the mean of its divisors is an integer number (15561651555).

Almost surely, 2^31123303109 is an apocalyptic number.

It is an amenable number.

31123303109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123303109 is an equidigital number, since it uses as much as digits as its factorization.

31123303109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 26.

The spelling of 31123303109 in words is "thirty-one billion, one hundred twenty-three million, three hundred three thousand, one hundred nine".