1268071909 has 4 divisors (see below), whose sum is σ = 1365615916. Its totient is φ = 1170527904.

The previous prime is 1268071879. The next prime is 1268071927. The reversal of 1268071909 is 9091708621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9091708621 = 2971 ⋅3060151.

It can be written as a sum of positive squares in 2 ways, for example, as 778689025 + 489382884 = 27905^2 + 22122^2 .

It is not a de Polignac number, because 1268071909 - 2⁷ = 1268071781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268071969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48771984 + ... + 48772009.

It is an arithmetic number, because the mean of its divisors is an integer number (341403979).

Almost surely, 2^1268071909 is an apocalyptic number.

It is an amenable number.

1268071909 is a deficient number, since it is larger than the sum of its proper divisors (97544007).

1268071909 is an equidigital number, since it uses as much as digits as its factorization.

1268071909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97544006.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1268071909 is about 35609.9973181690. The cubic root of 1268071909 is about 1082.3838259445.

The spelling of 1268071909 in words is "one billion, two hundred sixty-eight million, seventy-one thousand, nine hundred nine".