247311995813 has 2 divisors, whose sum is σ = 247311995814. Its totient is φ = 247311995812.

The previous prime is 247311995761. The next prime is 247311995831. The reversal of 247311995813 is 318599113742.

Together with next prime (247311995831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243910540129 + 3401455684 = 493873^2 + 58322^2 .

It is a cyclic number.

It is not a de Polignac number, because 247311995813 - 2²⁶ = 247244886949 is a prime.

It is a super-2 number, since 2×247311995813² (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 (247311995113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123655997906 + 123655997907.

It is an arithmetic number, because the mean of its divisors is an integer number (123655997907).

Almost surely, 2^247311995813 is an apocalyptic number.

It is an amenable number.

247311995813 is a deficient number, since it is larger than the sum of its proper divisors (1).

247311995813 is an equidigital number, since it uses as much as digits as its factorization.

247311995813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The spelling of 247311995813 in words is "two hundred forty-seven billion, three hundred eleven million, nine hundred ninety-five thousand, eight hundred thirteen".