247085645 has 4 divisors (see below), whose sum is σ = 296502780. Its totient is φ = 197668512.

The previous prime is 247085623. The next prime is 247085653. The reversal of 247085645 is 546580742.

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 121242121 + 125843524 = 11011^2 + 11218^2 .

It is a cyclic number.

It is not a de Polignac number, because 247085645 - 2²⁰ = 246037069 is a prime.

It is a super-3 number, since 3×247085645³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24708560 + ... + 24708569.

It is an arithmetic number, because the mean of its divisors is an integer number (74125695).

Almost surely, 2^247085645 is an apocalyptic number.

It is an amenable number.

247085645 is a deficient number, since it is larger than the sum of its proper divisors (49417135).

247085645 is an equidigital number, since it uses as much as digits as its factorization.

247085645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49417134.

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 247085645 is about 15718.9581397750. The cubic root of 247085645 is about 627.5030459686.

The spelling of 247085645 in words is "two hundred forty-seven million, eighty-five thousand, six hundred forty-five".