247249417 has 2 divisors, whose sum is σ = 247249418. Its totient is φ = 247249416.

The previous prime is 247249361. The next prime is 247249421. The reversal of 247249417 is 714942742.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245517561 + 1731856 = 15669^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 247249417 - 2²⁷ = 113031689 is a prime.

It is a super-2 number, since 2×247249417² = 122264548413679778, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 247249417.

It is not a weakly prime, because it can be changed into another prime (247249427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123624708 + 123624709.

It is an arithmetic number, because the mean of its divisors is an integer number (123624709).

Almost surely, 2^247249417 is an apocalyptic number.

It is an amenable number.

247249417 is a deficient number, since it is larger than the sum of its proper divisors (1).

247249417 is an equidigital number, since it uses as much as digits as its factorization.

247249417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 247249417 is about 15724.1666551840. The cubic root of 247249417 is about 627.6416547655.

The spelling of 247249417 in words is "two hundred forty-seven million, two hundred forty-nine thousand, four hundred seventeen".