1287231 has 16 divisors (see below), whose sum is σ = 1971840. Its totient is φ = 738720.

The previous prime is 1287217. The next prime is 1287233. The reversal of 1287231 is 1327821.

It is not a de Polignac number, because 1287231 - 2⁵ = 1287199 is a prime.

It is a super-2 number, since 2×1287231² = 3313927294722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (123240).

2^1287231 is an apocalyptic number.

1287231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1287231 is a deficient number, since it is larger than the sum of its proper divisors (684609).

1287231 is a wasteful number, since it uses less digits than its factorization.

1287231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086.

The product of its digits is 672, while the sum is 24.

The square root of 1287231 is about 1134.5620300363. The cubic root of 1287231 is about 108.7807787105.

The spelling of 1287231 in words is "one million, two hundred eighty-seven thousand, two hundred thirty-one".