247717139 has 2 divisors, whose sum is σ = 247717140. Its totient is φ = 247717138.

The previous prime is 247717111. The next prime is 247717181. The reversal of 247717139 is 931717742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247717139 - 2⁸ = 247716883 is a prime.

It is a super-2 number, since 2×247717139² = 122727561908690642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 247717096 and 247717105.

It is not a weakly prime, because it can be changed into another prime (247717189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123858569 + 123858570.

It is an arithmetic number, because the mean of its divisors is an integer number (123858570).

Almost surely, 2^247717139 is an apocalyptic number.

247717139 is a deficient number, since it is larger than the sum of its proper divisors (1).

247717139 is an equidigital number, since it uses as much as digits as its factorization.

247717139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 41.

The square root of 247717139 is about 15739.0323400138. The cubic root of 247717139 is about 628.0371756091.

The spelling of 247717139 in words is "two hundred forty-seven million, seven hundred seventeen thousand, one hundred thirty-nine".