31531363456 has 32 divisors (see below), whose sum is σ = 62853327180. Its totient is φ = 15756410880.

The previous prime is 31531363441. The next prime is 31531363459. The reversal of 31531363456 is 65436313513.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29520737856 + 2010625600 = 171816^2 + 44840^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (31531363459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148720 + ... + 291856.

Almost surely, 2^31531363456 is an apocalyptic number.

It is an amenable number.

31531363456 is a deficient number, since it is larger than the sum of its proper divisors (31321963724).

31531363456 is a wasteful number, since it uses less digits than its factorization.

31531363456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144872 (or 144860 counting only the distinct ones).

The product of its digits is 291600, while the sum is 40.

Adding to 31531363456 its reverse (65436313513), we get a palindrome (96967676969).

The spelling of 31531363456 in words is "thirty-one billion, five hundred thirty-one million, three hundred sixty-three thousand, four hundred fifty-six".