31431386605 has 16 divisors (see below), whose sum is σ = 38088167040. Its totient is φ = 24898404672.

The previous prime is 31431386603. The next prime is 31431386617. The reversal of 31431386605 is 50668313413.

It is a cyclic number.

It is not a de Polignac number, because 31431386605 - 2¹ = 31431386603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431386603) 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, 868992 + ... + 904438.

It is an arithmetic number, because the mean of its divisors is an integer number (2380510440).

Almost surely, 2^31431386605 is an apocalyptic number.

It is an amenable number.

31431386605 is a deficient number, since it is larger than the sum of its proper divisors (6656780435).

31431386605 is a wasteful number, since it uses less digits than its factorization.

31431386605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37188.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 31431386605 in words is "thirty-one billion, four hundred thirty-one million, three hundred eighty-six thousand, six hundred five".