1311608401 has 4 divisors (see below), whose sum is σ = 1311681600. Its totient is φ = 1311535204.

The previous prime is 1311608377. The next prime is 1311608407. The reversal of 1311608401 is 1048061131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1311608401 - 2⁵ = 1311608369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311608407) 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, 10380 + ... + 52258.

It is an arithmetic number, because the mean of its divisors is an integer number (327920400).

Almost surely, 2^1311608401 is an apocalyptic number.

It is an amenable number.

1311608401 is a deficient number, since it is larger than the sum of its proper divisors (73199).

1311608401 is an equidigital number, since it uses as much as digits as its factorization.

1311608401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73198.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1311608401 is about 36216.1345397324. The cubic root of 1311608401 is about 1094.6318065968.

Adding to 1311608401 its reverse (1048061131), we get a palindrome (2359669532).

The spelling of 1311608401 in words is "one billion, three hundred eleven million, six hundred eight thousand, four hundred one".