247986649 has 2 divisors, whose sum is σ = 247986650. Its totient is φ = 247986648.

The previous prime is 247986647. The next prime is 247986679. The reversal of 247986649 is 946689742.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204690249 + 43296400 = 14307^2 + 6580^2 .

It is a cyclic number.

It is not a de Polignac number, because 247986649 - 2¹ = 247986647 is a prime.

It is a super-2 number, since 2×247986649² = 122994756164498402, which contains 22 as substring.

Together with 247986647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 247986649.

It is not a weakly prime, because it can be changed into another prime (247986643) 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, 123993324 + 123993325.

It is an arithmetic number, because the mean of its divisors is an integer number (123993325).

Almost surely, 2^247986649 is an apocalyptic number.

It is an amenable number.

247986649 is a deficient number, since it is larger than the sum of its proper divisors (1).

247986649 is an equidigital number, since it uses as much as digits as its factorization.

247986649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 55.

The square root of 247986649 is about 15747.5918476445. The cubic root of 247986649 is about 628.2648559284.

The spelling of 247986649 in words is "two hundred forty-seven million, nine hundred eighty-six thousand, six hundred forty-nine".