31351444641 has 24 divisors (see below), whose sum is σ = 49548923424. Its totient is φ = 18944472960.

The previous prime is 31351444639. The next prime is 31351444661. The reversal of 31351444641 is 14644415313.

31351444641 is a `hidden beast` number, since 3 + 1 + 3 + 5 + 1 + 4 + 4 + 4 + 641 = 666.

It is not a de Polignac number, because 31351444641 - 2¹ = 31351444639 is a prime.

It is a super-3 number, since 3×31351444641³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31351444596 and 31351444605.

It is not an unprimeable number, because it can be changed into a prime (31351444661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436491 + ... + 503216.

It is an arithmetic number, because the mean of its divisors is an integer number (2064538476).

Almost surely, 2^31351444641 is an apocalyptic number.

It is an amenable number.

31351444641 is a deficient number, since it is larger than the sum of its proper divisors (18197478783).

31351444641 is a wasteful number, since it uses less digits than its factorization.

31351444641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940061 (or 940058 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 31351444641 its reverse (14644415313), we get a palindrome (45995859954).

It can be divided in two parts, 3 and 1351444641, that added together give a square (1351444644 = 36762²).

The spelling of 31351444641 in words is "thirty-one billion, three hundred fifty-one million, four hundred forty-four thousand, six hundred forty-one".