247117009 has 2 divisors, whose sum is σ = 247117010. Its totient is φ = 247117008.

The previous prime is 247116953. The next prime is 247117019. The reversal of 247117009 is 900711742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239011600 + 8105409 = 15460^2 + 2847^2 .

It is a cyclic number.

It is not a de Polignac number, because 247117009 - 2²¹ = 245019857 is a prime.

It is a super-2 number, since 2×247117009² = 122133632274212162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247117019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123558504 + 123558505.

It is an arithmetic number, because the mean of its divisors is an integer number (123558505).

Almost surely, 2^247117009 is an apocalyptic number.

It is an amenable number.

247117009 is a deficient number, since it is larger than the sum of its proper divisors (1).

247117009 is an equidigital number, since it uses as much as digits as its factorization.

247117009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 247117009 is about 15719.9557569352. The cubic root of 247117009 is about 627.5295957005.

The spelling of 247117009 in words is "two hundred forty-seven million, one hundred seventeen thousand, nine".