1313861 has 4 divisors (see below), whose sum is σ = 1316172. Its totient is φ = 1311552.

The previous prime is 1313857. The next prime is 1313863. The reversal of 1313861 is 1683131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 664225 = 806^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313861 - 2² = 1313857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (329043).

2^1313861 is an apocalyptic number.

It is an amenable number.

1313861 is a deficient number, since it is larger than the sum of its proper divisors (2311).

1313861 is a wasteful number, since it uses less digits than its factorization.

1313861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310.

The product of its digits is 432, while the sum is 23.

The square root of 1313861 is about 1146.2377589314. The cubic root of 1313861 is about 109.5258100304.

Adding to 1313861 its reverse (1683131), we get a palindrome (2996992).

The spelling of 1313861 in words is "one million, three hundred thirteen thousand, eight hundred sixty-one".