1278475611 has 12 divisors (see below), whose sum is σ = 1982941992. Its totient is φ = 730557408.

The previous prime is 1278475607. The next prime is 1278475651. The reversal of 1278475611 is 1165748721.

It is not a de Polignac number, because 1278475611 - 2² = 1278475607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278475651) 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 in 11 ways as a sum of consecutive naturals, for example, 4348410 + ... + 4348703.

It is an arithmetic number, because the mean of its divisors is an integer number (165245166).

Almost surely, 2^1278475611 is an apocalyptic number.

1278475611 is a deficient number, since it is larger than the sum of its proper divisors (704466381).

1278475611 is an equidigital number, since it uses as much as digits as its factorization.

1278475611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8697130 (or 8697123 counting only the distinct ones).

The product of its digits is 94080, while the sum is 42.

The square root of 1278475611 is about 35755.7773094083. Note that the first 3 decimals coincide. The cubic root of 1278475611 is about 1085.3358516313.

The spelling of 1278475611 in words is "one billion, two hundred seventy-eight million, four hundred seventy-five thousand, six hundred eleven".