31201131205 has 8 divisors (see below), whose sum is σ = 37453419000. Its totient is φ = 24952863936.

The previous prime is 31201131197. The next prime is 31201131223. The reversal of 31201131205 is 50213110213.

It can be written as a sum of positive squares in 4 ways, for example, as 4962638916 + 26238492289 = 70446^2 + 161983^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31201131205 - 2³ = 31201131197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 988030 + ... + 1019119.

It is an arithmetic number, because the mean of its divisors is an integer number (4681677375).

Almost surely, 2^31201131205 is an apocalyptic number.

It is an amenable number.

31201131205 is a deficient number, since it is larger than the sum of its proper divisors (6252287795).

31201131205 is a wasteful number, since it uses less digits than its factorization.

31201131205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010263.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 31201131205 its reverse (50213110213), we get a palindrome (81414241418).

The spelling of 31201131205 in words is "thirty-one billion, two hundred one million, one hundred thirty-one thousand, two hundred five".