1491863 has 2 divisors, whose sum is σ = 1491864. Its totient is φ = 1491862.

The previous prime is 1491859. The next prime is 1491911. The reversal of 1491863 is 3681941.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491863 - 2² = 1491859 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1497863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745931 + 745932.

It is an arithmetic number, because the mean of its divisors is an integer number (745932).

2^1491863 is an apocalyptic number.

1491863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491863 is an equidigital number, since it uses as much as digits as its factorization.

1491863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 1491863 is about 1221.4184377190. The cubic root of 1491863 is about 114.2640590666.

The spelling of 1491863 in words is "one million, four hundred ninety-one thousand, eight hundred sixty-three".