31504338361 has 2 divisors, whose sum is σ = 31504338362. Its totient is φ = 31504338360.

The previous prime is 31504338353. The next prime is 31504338373. The reversal of 31504338361 is 16383340513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30326132736 + 1178205625 = 174144^2 + 34325^2 .

It is a cyclic number.

It is not a de Polignac number, because 31504338361 - 2³ = 31504338353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31504338361.

It is not a weakly prime, because it can be changed into another prime (31504338391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15752169180 + 15752169181.

It is an arithmetic number, because the mean of its divisors is an integer number (15752169181).

Almost surely, 2^31504338361 is an apocalyptic number.

It is an amenable number.

31504338361 is a deficient number, since it is larger than the sum of its proper divisors (1).

31504338361 is an equidigital number, since it uses as much as digits as its factorization.

31504338361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 31504338361 its reverse (16383340513), we get a palindrome (47887678874).

The spelling of 31504338361 in words is "thirty-one billion, five hundred four million, three hundred thirty-eight thousand, three hundred sixty-one".