247940561 has 16 divisors (see below), whose sum is σ = 274881600. Its totient is φ = 221760000.

The previous prime is 247940533. The next prime is 247940587. The reversal of 247940561 is 165049742.

It is not a de Polignac number, because 247940561 - 2¹⁴ = 247924177 is a prime.

It is a super-2 number, since 2×247940561² = 122949043577989442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247940501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245225 + ... + 246233.

It is an arithmetic number, because the mean of its divisors is an integer number (17180100).

Almost surely, 2^247940561 is an apocalyptic number.

It is an amenable number.

247940561 is a deficient number, since it is larger than the sum of its proper divisors (26941039).

247940561 is a wasteful number, since it uses less digits than its factorization.

247940561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 247940561 is about 15746.1284447956. The cubic root of 247940561 is about 628.2259327783.

The spelling of 247940561 in words is "two hundred forty-seven million, nine hundred forty thousand, five hundred sixty-one".