247242717 has 6 divisors (see below), whose sum is σ = 357128382. Its totient is φ = 164828472.

The previous prime is 247242707. The next prime is 247242727. The reversal of 247242717 is 717242742.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (247242707) and next prime (247242727).

It can be written as a sum of positive squares in only one way, i.e., 178783641 + 68459076 = 13371^2 + 8274^2 .

It is not a de Polignac number, because 247242717 - 2⁸ = 247242461 is a prime.

It is a super-2 number, since 2×247242717² = 122257922219084178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247242707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13735698 + ... + 13735715.

It is an arithmetic number, because the mean of its divisors is an integer number (59521397).

Almost surely, 2^247242717 is an apocalyptic number.

It is an amenable number.

247242717 is a deficient number, since it is larger than the sum of its proper divisors (109885665).

247242717 is a wasteful number, since it uses less digits than its factorization.

247242717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27471419 (or 27471416 counting only the distinct ones).

The product of its digits is 43904, while the sum is 36.

The square root of 247242717 is about 15723.9536058842. The cubic root of 247242717 is about 627.6359854066.

The spelling of 247242717 in words is "two hundred forty-seven million, two hundred forty-two thousand, seven hundred seventeen".