31231030209 has 16 divisors (see below), whose sum is σ = 42165826560. Its totient is φ = 20559713360.

The previous prime is 31231030169. The next prime is 31231030231. The reversal of 31231030209 is 90203013213.

It is a cyclic number.

It is not a de Polignac number, because 31231030209 - 2¹⁷ = 31230899137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31231030279) 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 in 15 ways as a sum of consecutive naturals, for example, 56589 + ... + 256250.

It is an arithmetic number, because the mean of its divisors is an integer number (2635364160).

Almost surely, 2^31231030209 is an apocalyptic number.

It is an amenable number.

31231030209 is a deficient number, since it is larger than the sum of its proper divisors (10934796351).

31231030209 is a wasteful number, since it uses less digits than its factorization.

31231030209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313260.

The product of its (nonzero) digits is 972, while the sum is 24.

The spelling of 31231030209 in words is "thirty-one billion, two hundred thirty-one million, thirty thousand, two hundred nine".