31220124461 has 2 divisors, whose sum is σ = 31220124462. Its totient is φ = 31220124460.

The previous prime is 31220124389. The next prime is 31220124497. The reversal of 31220124461 is 16442102213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16824684100 + 14395440361 = 129710^2 + 119981^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220124461 - 2¹⁰ = 31220123437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220124461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220124961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610062230 + 15610062231.

It is an arithmetic number, because the mean of its divisors is an integer number (15610062231).

Almost surely, 2^31220124461 is an apocalyptic number.

It is an amenable number.

31220124461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220124461 is an equidigital number, since it uses as much as digits as its factorization.

31220124461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 31220124461 its reverse (16442102213), we get a palindrome (47662226674).

The spelling of 31220124461 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-four thousand, four hundred sixty-one".