1312661401 has 4 divisors (see below), whose sum is σ = 1312958052. Its totient is φ = 1312364752.

The previous prime is 1312661381. The next prime is 1312661407. The reversal of 1312661401 is 1041662131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1052678025 + 259983376 = 32445^2 + 16124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312661401 - 2⁹ = 1312660889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312661407) 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 3 ways as a sum of consecutive naturals, for example, 141586 + ... + 150571.

It is an arithmetic number, because the mean of its divisors is an integer number (328239513).

Almost surely, 2^1312661401 is an apocalyptic number.

It is an amenable number.

1312661401 is a deficient number, since it is larger than the sum of its proper divisors (296651).

1312661401 is an equidigital number, since it uses as much as digits as its factorization.

1312661401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296650.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1312661401 is about 36230.6693424231. The cubic root of 1312661401 is about 1094.9246630543.

The spelling of 1312661401 in words is "one billion, three hundred twelve million, six hundred sixty-one thousand, four hundred one".