31155000205 has 8 divisors (see below), whose sum is σ = 42726857472. Its totient is φ = 21363428688.

The previous prime is 31155000203. The next prime is 31155000269. The reversal of 31155000205 is 50200055113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31155000205 - 2¹ = 31155000203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31155000203) 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 in 7 ways as a sum of consecutive naturals, for example, 445071397 + ... + 445071466.

It is an arithmetic number, because the mean of its divisors is an integer number (5340857184).

Almost surely, 2^31155000205 is an apocalyptic number.

31155000205 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31155000205 is a deficient number, since it is larger than the sum of its proper divisors (11571857267).

31155000205 is an equidigital number, since it uses as much as digits as its factorization.

31155000205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890142875.

The product of its (nonzero) digits is 750, while the sum is 22.

Adding to 31155000205 its reverse (50200055113), we get a palindrome (81355055318).

The spelling of 31155000205 in words is "thirty-one billion, one hundred fifty-five million, two hundred five", and thus it is an aban number.