31225440461 has 2 divisors, whose sum is σ = 31225440462. Its totient is φ = 31225440460.

The previous prime is 31225440443. The next prime is 31225440497. The reversal of 31225440461 is 16404452213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30902124100 + 323316361 = 175790^2 + 17981^2 .

It is an emirp because it is prime and its reverse (16404452213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31225440461 - 2¹⁰ = 31225439437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31225440361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15612720230 + 15612720231.

It is an arithmetic number, because the mean of its divisors is an integer number (15612720231).

Almost surely, 2^31225440461 is an apocalyptic number.

It is an amenable number.

31225440461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31225440461 is an equidigital number, since it uses as much as digits as its factorization.

31225440461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 31225440461 its reverse (16404452213), we get a palindrome (47629892674).

The spelling of 31225440461 in words is "thirty-one billion, two hundred twenty-five million, four hundred forty thousand, four hundred sixty-one".