1287113 has 4 divisors (see below), whose sum is σ = 1318548. Its totient is φ = 1255680.

The previous prime is 1287109. The next prime is 1287131. The reversal of 1287113 is 3117821.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 727609 + 559504 = 853^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287113 - 2² = 1287109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287133) 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 in 3 ways as a sum of consecutive naturals, for example, 15656 + ... + 15737.

It is an arithmetic number, because the mean of its divisors is an integer number (329637).

2^1287113 is an apocalyptic number.

It is an amenable number.

1287113 is a deficient number, since it is larger than the sum of its proper divisors (31435).

1287113 is an equidigital number, since it uses as much as digits as its factorization.

1287113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31434.

The product of its digits is 336, while the sum is 23.

The square root of 1287113 is about 1134.5100263991. The cubic root of 1287113 is about 108.7774546440. Note that the first 3 decimals are identical.

The spelling of 1287113 in words is "one million, two hundred eighty-seven thousand, one hundred thirteen".