1287618734281 has 4 divisors (see below), whose sum is σ = 1404674982864. Its totient is φ = 1170562485700.

The previous prime is 1287618734183. The next prime is 1287618734287. The reversal of 1287618734281 is 1824378167821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1287618734281 - 2²³ = 1287610345673 is a prime.

It is a super-2 number, since 2×1287618734281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287618734287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58528124275 + ... + 58528124296.

It is an arithmetic number, because the mean of its divisors is an integer number (351168745716).

Almost surely, 2^{1287618734281} is an apocalyptic number.

1287618734281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1287618734281 is a deficient number, since it is larger than the sum of its proper divisors (117056248583).

1287618734281 is a wasteful number, since it uses less digits than its factorization.

1287618734281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117056248582.

The product of its digits is 7225344, while the sum is 58.

The spelling of 1287618734281 in words is "one trillion, two hundred eighty-seven billion, six hundred eighteen million, seven hundred thirty-four thousand, two hundred eighty-one".