1311888401 has 4 divisors (see below), whose sum is σ = 1312039092. Its totient is φ = 1311737712.

The previous prime is 1311888337. The next prime is 1311888433. The reversal of 1311888401 is 1048881131.

It is a Cunningham number, because it is equal to 36220²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1048881131 = 12583 ⋅83357.

It can be written as a sum of positive squares in 2 ways, for example, as 1074266176 + 237622225 = 32776^2 + 15415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311888401 - 2⁶ = 1311888337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311888451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61430 + ... + 79983.

It is an arithmetic number, because the mean of its divisors is an integer number (328009773).

Almost surely, 2^1311888401 is an apocalyptic number.

It is an amenable number.

1311888401 is a deficient number, since it is larger than the sum of its proper divisors (150691).

1311888401 is an equidigital number, since it uses as much as digits as its factorization.

1311888401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150690.

The product of its (nonzero) digits is 6144, while the sum is 35.

The square root of 1311888401 is about 36220.0000138045. Note that the first 4 decimals coincide. The cubic root of 1311888401 is about 1094.7096944527.

The spelling of 1311888401 in words is "one billion, three hundred eleven million, eight hundred eighty-eight thousand, four hundred one".