31503055481 has 2 divisors, whose sum is σ = 31503055482. Its totient is φ = 31503055480.

The previous prime is 31503055459. The next prime is 31503055483. The reversal of 31503055481 is 18455030513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31503055081 + 400 = 177491^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 31503055481 - 2³⁰ = 30429313657 is a prime.

It is a super-2 number, since 2×31503055481² (a number of 22 digits) contains 22 as substring.

Together with 31503055483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31503055483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15751527740 + 15751527741.

It is an arithmetic number, because the mean of its divisors is an integer number (15751527741).

Almost surely, 2^31503055481 is an apocalyptic number.

It is an amenable number.

31503055481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31503055481 is an equidigital number, since it uses as much as digits as its factorization.

31503055481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 31503055481 its reverse (18455030513), we get a palindrome (49958085994).

The spelling of 31503055481 in words is "thirty-one billion, five hundred three million, fifty-five thousand, four hundred eighty-one".