31315320405 has 24 divisors (see below), whose sum is σ = 54290457312. Its totient is φ = 16698252384.

The previous prime is 31315320403. The next prime is 31315320409. The reversal of 31315320405 is 50402351313.

It is not a de Polignac number, because 31315320405 - 2¹ = 31315320403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31315320403) 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 23 ways as a sum of consecutive naturals, for example, 175542 + ... + 305688.

It is an arithmetic number, because the mean of its divisors is an integer number (2262102388).

Almost surely, 2^31315320405 is an apocalyptic number.

It is an amenable number.

31315320405 is a deficient number, since it is larger than the sum of its proper divisors (22975136907).

31315320405 is a wasteful number, since it uses less digits than its factorization.

31315320405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135505 (or 135502 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 31315320405 its reverse (50402351313), we get a palindrome (81717671718).

The spelling of 31315320405 in words is "thirty-one billion, three hundred fifteen million, three hundred twenty thousand, four hundred five".