1331861 has 8 divisors (see below), whose sum is σ = 1409280. Its totient is φ = 1256112.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331861 is 1681331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331861 - 2² = 1331857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (176160).

2^1331861 is an apocalyptic number.

It is an amenable number.

1331861 is a deficient number, since it is larger than the sum of its proper divisors (77419).

1331861 is an equidigital number, since it uses as much as digits as its factorization.

1331861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835.

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

The square root of 1331861 is about 1154.0628232466. The cubic root of 1331861 is about 110.0237138956.

The spelling of 1331861 in words is "one million, three hundred thirty-one thousand, eight hundred sixty-one".