247390244861 has 2 divisors, whose sum is σ = 247390244862. Its totient is φ = 247390244860.

The previous prime is 247390244807. The next prime is 247390244921. The reversal of 247390244861 is 168442093742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140718765625 + 106671479236 = 375125^2 + 326606^2 .

It is a cyclic number.

It is not a de Polignac number, because 247390244861 - 2¹⁸ = 247389982717 is a prime.

It is a super-2 number, since 2×247390244861² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247390244161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123695122430 + 123695122431.

It is an arithmetic number, because the mean of its divisors is an integer number (123695122431).

Almost surely, 2^247390244861 is an apocalyptic number.

It is an amenable number.

247390244861 is a deficient number, since it is larger than the sum of its proper divisors (1).

247390244861 is an equidigital number, since it uses as much as digits as its factorization.

247390244861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 247390244861 in words is "two hundred forty-seven billion, three hundred ninety million, two hundred forty-four thousand, eight hundred sixty-one".