31200043409 has 2 divisors, whose sum is σ = 31200043410. Its totient is φ = 31200043408.

The previous prime is 31200043397. The next prime is 31200043439. The reversal of 31200043409 is 90434000213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24888217600 + 6311825809 = 157760^2 + 79447^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200043409 - 2¹⁶ = 31199977873 is a prime.

It is not a weakly prime, because it can be changed into another prime (31200043439) 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 as a sum of consecutive naturals, namely, 15600021704 + 15600021705.

It is an arithmetic number, because the mean of its divisors is an integer number (15600021705).

Almost surely, 2^31200043409 is an apocalyptic number.

It is an amenable number.

31200043409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200043409 is an equidigital number, since it uses as much as digits as its factorization.

31200043409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 31200043409 in words is "thirty-one billion, two hundred million, forty-three thousand, four hundred nine".