1312861 has 12 divisors (see below), whose sum is σ = 1488672. Its totient is φ = 1148000.

The previous prime is 1312853. The next prime is 1312867. The reversal of 1312861 is 1682131.

It is not a de Polignac number, because 1312861 - 2³ = 1312853 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18456 + ... + 18526.

It is an arithmetic number, because the mean of its divisors is an integer number (124056).

2^1312861 is an apocalyptic number.

1312861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312861 is a deficient number, since it is larger than the sum of its proper divisors (175811).

1312861 is an equidigital number, since it uses as much as digits as its factorization.

1312861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 123 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 1312861 is about 1145.8014662235. The cubic root of 1312861 is about 109.4980157129.

Adding to 1312861 its reverse (1682131), we get a palindrome (2994992).

It can be divided in two parts, 131 and 2861, that added together give a palindrome (2992).

The spelling of 1312861 in words is "one million, three hundred twelve thousand, eight hundred sixty-one".