31405440256 has 18 divisors (see below), whose sum is σ = 62688203522. Its totient is φ = 15702720000.

The previous prime is 31405440217. The next prime is 31405440329. The reversal of 31405440256 is 65204450413.

It can be written as a sum of positive squares in only one way, i.e., 28905440256 + 2500000000 = 170016^2 + 50000^2 .

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 as a sum of consecutive naturals, namely, 61338495 + ... + 61339006.

Almost surely, 2^31405440256 is an apocalyptic number.

It is an amenable number.

31405440256 is a deficient number, since it is larger than the sum of its proper divisors (31282763266).

31405440256 is an equidigital number, since it uses as much as digits as its factorization.

31405440256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122677517 (or 122677503 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 31405440256 its reverse (65204450413), we get a palindrome (96609890669).

The spelling of 31405440256 in words is "thirty-one billion, four hundred five million, four hundred forty thousand, two hundred fifty-six".