247345513 has 4 divisors (see below), whose sum is σ = 249005700. Its totient is φ = 245685328.

The previous prime is 247345489. The next prime is 247345583. The reversal of 247345513 is 315543742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151462249 + 95883264 = 12307^2 + 9792^2 .

It is a cyclic number.

It is not a de Polignac number, because 247345513 - 2¹⁷ = 247214441 is a prime.

It is a super-2 number, since 2×247345513² = 122359605602466338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247345583) 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, 829870 + ... + 830167.

It is an arithmetic number, because the mean of its divisors is an integer number (62251425).

Almost surely, 2^247345513 is an apocalyptic number.

It is an amenable number.

247345513 is a deficient number, since it is larger than the sum of its proper divisors (1660187).

247345513 is a wasteful number, since it uses less digits than its factorization.

247345513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660186.

The product of its digits is 50400, while the sum is 34.

The square root of 247345513 is about 15727.2220369651. Note that the first 3 decimals coincide. The cubic root of 247345513 is about 627.7229573371.

The spelling of 247345513 in words is "two hundred forty-seven million, three hundred forty-five thousand, five hundred thirteen".