1287109253 has 4 divisors (see below), whose sum is σ = 1362821580. Its totient is φ = 1211396928.

The previous prime is 1287109231. The next prime is 1287109259. The reversal of 1287109253 is 3529017821.

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 835036609 + 452072644 = 28897^2 + 21262^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287109253 - 2²⁶ = 1220000389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287109259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37856138 + ... + 37856171.

It is an arithmetic number, because the mean of its divisors is an integer number (340705395).

Almost surely, 2^1287109253 is an apocalyptic number.

It is an amenable number.

1287109253 is a deficient number, since it is larger than the sum of its proper divisors (75712327).

1287109253 is an equidigital number, since it uses as much as digits as its factorization.

1287109253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75712326.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1287109253 is about 35876.3048961289. The cubic root of 1287109253 is about 1087.7734908752.

The spelling of 1287109253 in words is "one billion, two hundred eighty-seven million, one hundred nine thousand, two hundred fifty-three".