31206432005 has 16 divisors (see below), whose sum is σ = 42960132864. Its totient is φ = 21317326080.

The previous prime is 31206431987. The next prime is 31206432017. The reversal of 31206432005 is 50023460213.

It is not a de Polignac number, because 31206432005 - 2²⁶ = 31139323141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685876 + ... + 1704285.

It is an arithmetic number, because the mean of its divisors is an integer number (2685008304).

Almost surely, 2^31206432005 is an apocalyptic number.

31206432005 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31206432005 is a deficient number, since it is larger than the sum of its proper divisors (11753700859).

31206432005 is a wasteful number, since it uses less digits than its factorization.

31206432005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390436.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31206432005 its reverse (50023460213), we get a palindrome (81229892218).

The spelling of 31206432005 in words is "thirty-one billion, two hundred six million, four hundred thirty-two thousand, five".