1287081123 has 4 divisors (see below), whose sum is σ = 1716108168. Its totient is φ = 858054080.

The previous prime is 1287081121. The next prime is 1287081209. The reversal of 1287081123 is 3211807821.

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 1287081123 - 2¹ = 1287081121 is a prime.

It is a super-2 number, since 2×1287081123² = 3313155634365882258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287081121) 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, 214513518 + ... + 214513523.

It is an arithmetic number, because the mean of its divisors is an integer number (429027042).

Almost surely, 2^1287081123 is an apocalyptic number.

1287081123 is a deficient number, since it is larger than the sum of its proper divisors (429027045).

1287081123 is an equidigital number, since it uses as much as digits as its factorization.

1287081123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429027044.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1287081123 is about 35875.9128524976. The cubic root of 1287081123 is about 1087.7655663235.

Adding to 1287081123 its reverse (3211807821), we get a palindrome (4498888944).

The spelling of 1287081123 in words is "one billion, two hundred eighty-seven million, eighty-one thousand, one hundred twenty-three".