247440720349 has 2 divisors, whose sum is σ = 247440720350. Its totient is φ = 247440720348.

The previous prime is 247440720337. The next prime is 247440720403. The reversal of 247440720349 is 943027044742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146899725625 + 100540994724 = 383275^2 + 317082^2 .

It is a cyclic number.

It is not a de Polignac number, because 247440720349 - 2²¹ = 247438623197 is a prime.

It is a super-2 number, since 2×247440720349² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247440720299 and 247440720308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247440720049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123720360174 + 123720360175.

It is an arithmetic number, because the mean of its divisors is an integer number (123720360175).

Almost surely, 2^247440720349 is an apocalyptic number.

It is an amenable number.

247440720349 is a deficient number, since it is larger than the sum of its proper divisors (1).

247440720349 is an equidigital number, since it uses as much as digits as its factorization.

247440720349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 46.

The spelling of 247440720349 in words is "two hundred forty-seven billion, four hundred forty million, seven hundred twenty thousand, three hundred forty-nine".