31450030561 has 2 divisors, whose sum is σ = 31450030562. Its totient is φ = 31450030560.

The previous prime is 31450030553. The next prime is 31450030637. The reversal of 31450030561 is 16503005413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31263544225 + 186486336 = 176815^2 + 13656^2 .

It is an emirp because it is prime and its reverse (16503005413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31450030561 - 2³ = 31450030553 is a prime.

It is not a weakly prime, because it can be changed into another prime (31450030361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15725015280 + 15725015281.

It is an arithmetic number, because the mean of its divisors is an integer number (15725015281).

Almost surely, 2^31450030561 is an apocalyptic number.

It is an amenable number.

31450030561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31450030561 is an equidigital number, since it uses as much as digits as its factorization.

31450030561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 31450030561 its reverse (16503005413), we get a palindrome (47953035974).

The spelling of 31450030561 in words is "thirty-one billion, four hundred fifty million, thirty thousand, five hundred sixty-one".