247085831 has 2 divisors, whose sum is σ = 247085832. Its totient is φ = 247085830.

The previous prime is 247085819. The next prime is 247085833. The reversal of 247085831 is 138580742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247085831 - 2¹⁴ = 247069447 is a prime.

It is a super-2 number, since 2×247085831² = 122102815761921122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 247085833, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247085833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123542915 + 123542916.

It is an arithmetic number, because the mean of its divisors is an integer number (123542916).

Almost surely, 2^247085831 is an apocalyptic number.

247085831 is a deficient number, since it is larger than the sum of its proper divisors (1).

247085831 is an equidigital number, since it uses as much as digits as its factorization.

247085831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 247085831 is about 15718.9640561966. The cubic root of 247085831 is about 627.5032034249.

The spelling of 247085831 in words is "two hundred forty-seven million, eighty-five thousand, eight hundred thirty-one".