31551205450241 has 12 divisors (see below), whose sum is σ = 33491675632212. Its totient is φ = 29717837505504.

The previous prime is 31551205450217. The next prime is 31551205450273. The reversal of 31551205450241 is 14205450215513.

It can be written as a sum of positive squares in 2 ways, for example, as 29257237728016 + 2293967722225 = 5408996^2 + 1514585^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31551205450241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31551205450195 and 31551205450204.

It is not an unprimeable number, because it can be changed into a prime (31551205450741) 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 11 ways as a sum of consecutive naturals, for example, 252537146 + ... + 252662051.

It is an arithmetic number, because the mean of its divisors is an integer number (2790972969351).

Almost surely, 2^{31551205450241} is an apocalyptic number.

It is an amenable number.

31551205450241 is a deficient number, since it is larger than the sum of its proper divisors (1940470181971).

31551205450241 is a wasteful number, since it uses less digits than its factorization.

31551205450241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505199408 (or 505199389 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 31551205450241 its reverse (14205450215513), we get a palindrome (45756655665754).

The spelling of 31551205450241 in words is "thirty-one trillion, five hundred fifty-one billion, two hundred five million, four hundred fifty thousand, two hundred forty-one".