1311078401 has 4 divisors (see below), whose sum is σ = 1311207492. Its totient is φ = 1310949312.

The previous prime is 1311078341. The next prime is 1311078421. The reversal of 1311078401 is 1048701131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1048701131 = 883 ⋅1187657.

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 1300684225 = 3224^2 + 36065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311078401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311078421) 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, 47876 + ... + 70101.

It is an arithmetic number, because the mean of its divisors is an integer number (327801873).

Almost surely, 2^1311078401 is an apocalyptic number.

It is an amenable number.

1311078401 is a deficient number, since it is larger than the sum of its proper divisors (129091).

1311078401 is a wasteful number, since it uses less digits than its factorization.

1311078401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129090.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 1311078401 is about 36208.8166197129. The cubic root of 1311078401 is about 1094.4843456580.

Adding to 1311078401 its reverse (1048701131), we get a palindrome (2359779532).

The spelling of 1311078401 in words is "one billion, three hundred eleven million, seventy-eight thousand, four hundred one".