31550443481 has 2 divisors, whose sum is σ = 31550443482. Its totient is φ = 31550443480.

The previous prime is 31550443459. The next prime is 31550443517. The reversal of 31550443481 is 18434405513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30415360000 + 1135083481 = 174400^2 + 33691^2 .

It is a cyclic number.

It is not a de Polignac number, because 31550443481 - 2¹⁸ = 31550181337 is a prime.

It is a super-2 number, since 2×31550443481² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31550443681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15775221740 + 15775221741.

It is an arithmetic number, because the mean of its divisors is an integer number (15775221741).

Almost surely, 2^31550443481 is an apocalyptic number.

It is an amenable number.

31550443481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31550443481 is an equidigital number, since it uses as much as digits as its factorization.

31550443481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 31550443481 its reverse (18434405513), we get a palindrome (49984848994).

The spelling of 31550443481 in words is "thirty-one billion, five hundred fifty million, four hundred forty-three thousand, four hundred eighty-one".