1268015849 has 2 divisors, whose sum is σ = 1268015850. Its totient is φ = 1268015848.

The previous prime is 1268015821. The next prime is 1268015851. The reversal of 1268015849 is 9485108621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1247149225 + 20866624 = 35315^2 + 4568^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268015849 - 2¹² = 1268011753 is a prime.

Together with 1268015851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1268015899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634007924 + 634007925.

It is an arithmetic number, because the mean of its divisors is an integer number (634007925).

Almost surely, 2^1268015849 is an apocalyptic number.

It is an amenable number.

1268015849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268015849 is an equidigital number, since it uses as much as digits as its factorization.

1268015849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 1268015849 is about 35609.2101709656. The cubic root of 1268015849 is about 1082.3678753949.

The spelling of 1268015849 in words is "one billion, two hundred sixty-eight million, fifteen thousand, eight hundred forty-nine".