1331863 has 4 divisors (see below), whose sum is σ = 1434328. Its totient is φ = 1229400.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331863 is 3681331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3681331 = 1367 ⋅2693.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331863 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 (1331063) 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, 51213 + ... + 51238.

It is an arithmetic number, because the mean of its divisors is an integer number (358582).

2^1331863 is an apocalyptic number.

1331863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1331863 is a deficient number, since it is larger than the sum of its proper divisors (102465).

1331863 is a wasteful number, since it uses less digits than its factorization.

1331863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102464.

The product of its digits is 1296, while the sum is 25.

The square root of 1331863 is about 1154.0636897503. The cubic root of 1331863 is about 110.0237689683.

The spelling of 1331863 in words is "one million, three hundred thirty-one thousand, eight hundred sixty-three".