247917949 has 2 divisors, whose sum is σ = 247917950. Its totient is φ = 247917948.

The previous prime is 247917937. The next prime is 247917959. The reversal of 247917949 is 949719742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159896025 + 88021924 = 12645^2 + 9382^2 .

It is a cyclic number.

It is not a de Polignac number, because 247917949 - 2⁷ = 247917821 is a prime.

It is a super-2 number, since 2×247917949² = 122926618872733202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247917896 and 247917905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247917959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123958974 + 123958975.

It is an arithmetic number, because the mean of its divisors is an integer number (123958975).

Almost surely, 2^247917949 is an apocalyptic number.

It is an amenable number.

247917949 is a deficient number, since it is larger than the sum of its proper divisors (1).

247917949 is an equidigital number, since it uses as much as digits as its factorization.

247917949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 247917949 is about 15745.4104106562. The cubic root of 247917949 is about 628.2068342807.

The spelling of 247917949 in words is "two hundred forty-seven million, nine hundred seventeen thousand, nine hundred forty-nine".