247305641 has 4 divisors (see below), whose sum is σ = 269787984. Its totient is φ = 224823300.

The previous prime is 247305607. The next prime is 247305659. The reversal of 247305641 is 146503742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247305641 is a prime.

It is a super-2 number, since 2×247305641² = 122320160140841762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247305598 and 247305607.

It is not an unprimeable number, because it can be changed into a prime (247305601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11241155 + ... + 11241176.

It is an arithmetic number, because the mean of its divisors is an integer number (67446996).

Almost surely, 2^247305641 is an apocalyptic number.

It is an amenable number.

247305641 is a deficient number, since it is larger than the sum of its proper divisors (22482343).

247305641 is a wasteful number, since it uses less digits than its factorization.

247305641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22482342.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 247305641 is about 15725.9543748543. The cubic root of 247305641 is about 627.6892259594.

The spelling of 247305641 in words is "two hundred forty-seven million, three hundred five thousand, six hundred forty-one".