247536221393 has 2 divisors, whose sum is σ = 247536221394. Its totient is φ = 247536221392.

The previous prime is 247536221371. The next prime is 247536221411. The reversal of 247536221393 is 393122635742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243387315649 + 4148905744 = 493343^2 + 64412^2 .

It is a cyclic number.

It is not a de Polignac number, because 247536221393 - 2¹⁴ = 247536205009 is a prime.

It is a super-2 number, since 2×247536221393² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247536221693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123768110696 + 123768110697.

It is an arithmetic number, because the mean of its divisors is an integer number (123768110697).

Almost surely, 2^247536221393 is an apocalyptic number.

It is an amenable number.

247536221393 is a deficient number, since it is larger than the sum of its proper divisors (1).

247536221393 is an equidigital number, since it uses as much as digits as its factorization.

247536221393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 47.

The spelling of 247536221393 in words is "two hundred forty-seven billion, five hundred thirty-six million, two hundred twenty-one thousand, three hundred ninety-three".