31305440405 has 32 divisors (see below), whose sum is σ = 39138422400. Its totient is φ = 24009253632.

The previous prime is 31305440399. The next prime is 31305440417. The reversal of 31305440405 is 50404450313.

It is a cyclic number.

It is not a de Polignac number, because 31305440405 - 2¹⁴ = 31305424021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 21108794 + ... + 21110276.

It is an arithmetic number, because the mean of its divisors is an integer number (1223075700).

Almost surely, 2^31305440405 is an apocalyptic number.

It is an amenable number.

31305440405 is a deficient number, since it is larger than the sum of its proper divisors (7832981995).

31305440405 is a wasteful number, since it uses less digits than its factorization.

31305440405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 31305440405 its reverse (50404450313), we get a palindrome (81709890718).

The spelling of 31305440405 in words is "thirty-one billion, three hundred five million, four hundred forty thousand, four hundred five".