1284631 has 2 divisors, whose sum is σ = 1284632. Its totient is φ = 1284630.

The previous prime is 1284623. The next prime is 1284641. The reversal of 1284631 is 1364821.

It is a weak prime.

It is an emirp because it is prime and its reverse (1364821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1284631 - 2³ = 1284623 is a prime.

It is a super-2 number, since 2×1284631² = 3300553612322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1284596 and 1284605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1284601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642315 + 642316.

It is an arithmetic number, because the mean of its divisors is an integer number (642316).

2^1284631 is an apocalyptic number.

1284631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284631 is an equidigital number, since it uses as much as digits as its factorization.

1284631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 1284631 is about 1133.4156342666. The cubic root of 1284631 is about 108.7074894401.

The spelling of 1284631 in words is "one million, two hundred eighty-four thousand, six hundred thirty-one".