247877989 has 2 divisors, whose sum is σ = 247877990. Its totient is φ = 247877988.

The previous prime is 247877977. The next prime is 247878011. The reversal of 247877989 is 989778742.

247877989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205692964 + 42185025 = 14342^2 + 6495^2 .

It is a cyclic number.

It is not a de Polignac number, because 247877989 - 2¹¹ = 247875941 is a prime.

It is a super-2 number, since 2×247877989² = 122886994861368242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247877089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123938994 + 123938995.

It is an arithmetic number, because the mean of its divisors is an integer number (123938995).

Almost surely, 2^247877989 is an apocalyptic number.

It is an amenable number.

247877989 is a deficient number, since it is larger than the sum of its proper divisors (1).

247877989 is an equidigital number, since it uses as much as digits as its factorization.

247877989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 61.

The square root of 247877989 is about 15744.1414183181. The cubic root of 247877989 is about 628.1730805138.

The spelling of 247877989 in words is "two hundred forty-seven million, eight hundred seventy-seven thousand, nine hundred eighty-nine".