247720559 has 2 divisors, whose sum is σ = 247720560. Its totient is φ = 247720558.

The previous prime is 247720547. The next prime is 247720567. The reversal of 247720559 is 955027742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247720559 - 2⁸ = 247720303 is a prime.

It is a super-2 number, since 2×247720559² = 122730950702544962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247720589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123860279 + 123860280.

It is an arithmetic number, because the mean of its divisors is an integer number (123860280).

Almost surely, 2^247720559 is an apocalyptic number.

247720559 is a deficient number, since it is larger than the sum of its proper divisors (1).

247720559 is an equidigital number, since it uses as much as digits as its factorization.

247720559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 247720559 is about 15739.1409867248. The cubic root of 247720559 is about 628.0400658374.

The spelling of 247720559 in words is "two hundred forty-seven million, seven hundred twenty thousand, five hundred fifty-nine".