247624561 has 2 divisors, whose sum is σ = 247624562. Its totient is φ = 247624560.

The previous prime is 247624493. The next prime is 247624571. The reversal of 247624561 is 165426742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240095025 + 7529536 = 15495^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 247624561 - 2²⁷ = 113406833 is a prime.

It is a super-2 number, since 2×247624561² = 122635846420885442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247624561.

It is not a weakly prime, because it can be changed into another prime (247624571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123812280 + 123812281.

It is an arithmetic number, because the mean of its divisors is an integer number (123812281).

Almost surely, 2^247624561 is an apocalyptic number.

It is an amenable number.

247624561 is a deficient number, since it is larger than the sum of its proper divisors (1).

247624561 is an equidigital number, since it uses as much as digits as its factorization.

247624561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 37.

The square root of 247624561 is about 15736.0910330361. The cubic root of 247624561 is about 627.9589282036.

The spelling of 247624561 in words is "two hundred forty-seven million, six hundred twenty-four thousand, five hundred sixty-one".