247676813 has 2 divisors, whose sum is σ = 247676814. Its totient is φ = 247676812.

The previous prime is 247676801. The next prime is 247676851. The reversal of 247676813 is 318676742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238300969 + 9375844 = 15437^2 + 3062^2 .

It is a cyclic number.

It is not a de Polignac number, because 247676813 - 2¹⁴ = 247660429 is a prime.

It is a super-2 number, since 2×247676813² = 122687607395673938, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247676713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123838406 + 123838407.

It is an arithmetic number, because the mean of its divisors is an integer number (123838407).

Almost surely, 2^247676813 is an apocalyptic number.

It is an amenable number.

247676813 is a deficient number, since it is larger than the sum of its proper divisors (1).

247676813 is an equidigital number, since it uses as much as digits as its factorization.

247676813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The square root of 247676813 is about 15737.7512053025. The cubic root of 247676813 is about 628.0030942617.

The spelling of 247676813 in words is "two hundred forty-seven million, six hundred seventy-six thousand, eight hundred thirteen".