31283145209 has 16 divisors (see below), whose sum is σ = 32146139520. Its totient is φ = 30434315520.

The previous prime is 31283145203. The next prime is 31283145233. The reversal of 31283145209 is 90254138213.

It is a cyclic number.

It is not a de Polignac number, because 31283145209 - 2⁴ = 31283145193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31283145203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1828754 + ... + 1845780.

It is an arithmetic number, because the mean of its divisors is an integer number (2009133720).

Almost surely, 2^31283145209 is an apocalyptic number.

It is an amenable number.

31283145209 is a deficient number, since it is larger than the sum of its proper divisors (862994311).

31283145209 is a wasteful number, since it uses less digits than its factorization.

31283145209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17440.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 31283145209 in words is "thirty-one billion, two hundred eighty-three million, one hundred forty-five thousand, two hundred nine".