1287129883 has 4 divisors (see below), whose sum is σ = 1386139888. Its totient is φ = 1188119880.

The previous prime is 1287129821. The next prime is 1287129911. The reversal of 1287129883 is 3889217821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3889217821 = 23 ⋅169096427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287129883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287129583) 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, 49504983 + ... + 49505008.

It is an arithmetic number, because the mean of its divisors is an integer number (346534972).

Almost surely, 2^1287129883 is an apocalyptic number.

1287129883 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1287129883 is a deficient number, since it is larger than the sum of its proper divisors (99010005).

1287129883 is an equidigital number, since it uses as much as digits as its factorization.

1287129883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99010004.

The product of its digits is 387072, while the sum is 49.

The square root of 1287129883 is about 35876.5924106513. The cubic root of 1287129883 is about 1087.7793025153.

The spelling of 1287129883 in words is "one billion, two hundred eighty-seven million, one hundred twenty-nine thousand, eight hundred eighty-three".