31123203049 has 2 divisors, whose sum is σ = 31123203050. Its totient is φ = 31123203048.

The previous prime is 31123203029. The next prime is 31123203121. The reversal of 31123203049 is 94030232113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29916891225 + 1206311824 = 172965^2 + 34732^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123203049 - 2⁷ = 31123202921 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123203029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561601524 + 15561601525.

It is an arithmetic number, because the mean of its divisors is an integer number (15561601525).

Almost surely, 2^31123203049 is an apocalyptic number.

It is an amenable number.

31123203049 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123203049 is an equidigital number, since it uses as much as digits as its factorization.

31123203049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 31123203049 in words is "thirty-one billion, one hundred twenty-three million, two hundred three thousand, forty-nine".