31475345789 has 2 divisors, whose sum is σ = 31475345790. Its totient is φ = 31475345788.

The previous prime is 31475345761. The next prime is 31475345807. The reversal of 31475345789 is 98754357413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22233792100 + 9241553689 = 149110^2 + 96133^2 .

It is a cyclic number.

It is not a de Polignac number, because 31475345789 - 2²⁰ = 31474297213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31475345089) 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 as a sum of consecutive naturals, namely, 15737672894 + 15737672895.

It is an arithmetic number, because the mean of its divisors is an integer number (15737672895).

Almost surely, 2^31475345789 is an apocalyptic number.

It is an amenable number.

31475345789 is a deficient number, since it is larger than the sum of its proper divisors (1).

31475345789 is an equidigital number, since it uses as much as digits as its factorization.

31475345789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 56.

The spelling of 31475345789 in words is "thirty-one billion, four hundred seventy-five million, three hundred forty-five thousand, seven hundred eighty-nine".