247250561 has 2 divisors, whose sum is σ = 247250562. Its totient is φ = 247250560.

The previous prime is 247250557. The next prime is 247250587. The reversal of 247250561 is 165052742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221444161 + 25806400 = 14881^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 247250561 - 2² = 247250557 is a prime.

It is a super-2 number, since 2×247250561² = 122265679829629442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247250501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123625280 + 123625281.

It is an arithmetic number, because the mean of its divisors is an integer number (123625281).

Almost surely, 2^247250561 is an apocalyptic number.

It is an amenable number.

247250561 is a deficient number, since it is larger than the sum of its proper divisors (1).

247250561 is an equidigital number, since it uses as much as digits as its factorization.

247250561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 247250561 is about 15724.2030322684. The cubic root of 247250561 is about 627.6426227771.

The spelling of 247250561 in words is "two hundred forty-seven million, two hundred fifty thousand, five hundred sixty-one".