247343561 has 2 divisors, whose sum is σ = 247343562. Its totient is φ = 247343560.

The previous prime is 247343531. The next prime is 247343641. The reversal of 247343561 is 165343742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188897536 + 58446025 = 13744^2 + 7645^2 .

It is a cyclic number.

It is not a de Polignac number, because 247343561 - 2¹⁴ = 247327177 is a prime.

It is a super-2 number, since 2×247343561² = 122357674336321442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247343521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123671780 + 123671781.

It is an arithmetic number, because the mean of its divisors is an integer number (123671781).

Almost surely, 2^247343561 is an apocalyptic number.

It is an amenable number.

247343561 is a deficient number, since it is larger than the sum of its proper divisors (1).

247343561 is an equidigital number, since it uses as much as digits as its factorization.

247343561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 247343561 is about 15727.1599788392. The cubic root of 247343561 is about 627.7213060459.

The spelling of 247343561 in words is "two hundred forty-seven million, three hundred forty-three thousand, five hundred sixty-one".