247439081 has 2 divisors, whose sum is σ = 247439082. Its totient is φ = 247439080.

The previous prime is 247439021. The next prime is 247439089. The reversal of 247439081 is 180934742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221265625 + 26173456 = 14875^2 + 5116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247439081 is a prime.

It is a super-2 number, since 2×247439081² = 122452197612249122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247439089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123719540 + 123719541.

It is an arithmetic number, because the mean of its divisors is an integer number (123719541).

Almost surely, 2^247439081 is an apocalyptic number.

It is an amenable number.

247439081 is a deficient number, since it is larger than the sum of its proper divisors (1).

247439081 is an equidigital number, since it uses as much as digits as its factorization.

247439081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 247439081 is about 15730.1964704831. The cubic root of 247439081 is about 627.8021008481.

The spelling of 247439081 in words is "two hundred forty-seven million, four hundred thirty-nine thousand, eighty-one".