247731713 has 4 divisors (see below), whose sum is σ = 249309780. Its totient is φ = 246153648.

The previous prime is 247731703. The next prime is 247731727. The reversal of 247731713 is 317137742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317137742 = 2 ⋅158568871.

It can be written as a sum of positive squares in 2 ways, for example, as 139405249 + 108326464 = 11807^2 + 10408^2 .

It is a cyclic number.

It is not a de Polignac number, because 247731713 - 2⁸ = 247731457 is a prime.

It is a super-2 number, since 2×247731713² = 122742003251828738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247731703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788798 + ... + 789111.

It is an arithmetic number, because the mean of its divisors is an integer number (62327445).

Almost surely, 2^247731713 is an apocalyptic number.

It is an amenable number.

247731713 is a deficient number, since it is larger than the sum of its proper divisors (1578067).

247731713 is a wasteful number, since it uses less digits than its factorization.

247731713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578066.

The product of its digits is 24696, while the sum is 35.

The square root of 247731713 is about 15739.4953222776. The cubic root of 247731713 is about 628.0494918532.

The spelling of 247731713 in words is "two hundred forty-seven million, seven hundred thirty-one thousand, seven hundred thirteen".