1287523133 has 4 divisors (see below), whose sum is σ = 1386563388. Its totient is φ = 1188482880.

The previous prime is 1287523109. The next prime is 1287523147. The reversal of 1287523133 is 3313257821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3313257821 = 157 ⋅21103553.

It can be written as a sum of positive squares in 2 ways, for example, as 270997444 + 1016525689 = 16462^2 + 31883^2 .

It is not a de Polignac number, because 1287523133 - 2¹⁴ = 1287506749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1287523093 and 1287523102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287523103) 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, 49520108 + ... + 49520133.

It is an arithmetic number, because the mean of its divisors is an integer number (346640847).

Almost surely, 2^1287523133 is an apocalyptic number.

1287523133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1287523133 is a deficient number, since it is larger than the sum of its proper divisors (99040255).

1287523133 is an equidigital number, since it uses as much as digits as its factorization.

1287523133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99040254.

The product of its digits is 30240, while the sum is 35.

The square root of 1287523133 is about 35882.0725850668. The cubic root of 1287523133 is about 1087.8900723915.

The spelling of 1287523133 in words is "one billion, two hundred eighty-seven million, five hundred twenty-three thousand, one hundred thirty-three".