247305889 has 2 divisors, whose sum is σ = 247305890. Its totient is φ = 247305888.

The previous prime is 247305871. The next prime is 247305893. The reversal of 247305889 is 988503742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247118400 + 187489 = 15720^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 247305889 - 2¹⁵ = 247273121 is a prime.

It is a super-2 number, since 2×247305889² = 122320405468160642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247305829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123652944 + 123652945.

It is an arithmetic number, because the mean of its divisors is an integer number (123652945).

Almost surely, 2^247305889 is an apocalyptic number.

It is an amenable number.

247305889 is a deficient number, since it is larger than the sum of its proper divisors (1).

247305889 is an equidigital number, since it uses as much as digits as its factorization.

247305889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 247305889 is about 15725.9622599064. The cubic root of 247305889 is about 627.6894357765.

The spelling of 247305889 in words is "two hundred forty-seven million, three hundred five thousand, eight hundred eighty-nine".