1283631 has 4 divisors (see below), whose sum is σ = 1711512. Its totient is φ = 855752.

The previous prime is 1283603. The next prime is 1283677. The reversal of 1283631 is 1363821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1283631 - 2⁹ = 1283119 is a prime.

It is a super-2 number, since 2×1283631² = 3295417088322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283731) 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, 213936 + ... + 213941.

It is an arithmetic number, because the mean of its divisors is an integer number (427878).

2^1283631 is an apocalyptic number.

1283631 is a deficient number, since it is larger than the sum of its proper divisors (427881).

1283631 is an equidigital number, since it uses as much as digits as its factorization.

1283631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427880.

The product of its digits is 864, while the sum is 24.

The square root of 1283631 is about 1132.9744039474. The cubic root of 1283631 is about 108.6792749285.

The spelling of 1283631 in words is "one million, two hundred eighty-three thousand, six hundred thirty-one".