247236461 has 2 divisors, whose sum is σ = 247236462. Its totient is φ = 247236460.

The previous prime is 247236427. The next prime is 247236463. The reversal of 247236461 is 164632742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206353225 + 40883236 = 14365^2 + 6394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247236461 is a prime.

It is a super-2 number, since 2×247236461² = 122251735295609042, which contains 22 as substring.

Together with 247236463, 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 (247236463) 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, 123618230 + 123618231.

It is an arithmetic number, because the mean of its divisors is an integer number (123618231).

Almost surely, 2^247236461 is an apocalyptic number.

It is an amenable number.

247236461 is a deficient number, since it is larger than the sum of its proper divisors (1).

247236461 is an equidigital number, since it uses as much as digits as its factorization.

247236461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 247236461 is about 15723.7546724693. The cubic root of 247236461 is about 627.6306916560.

The spelling of 247236461 in words is "two hundred forty-seven million, two hundred thirty-six thousand, four hundred sixty-one".