1286891099 has 4 divisors (see below), whose sum is σ = 1385882736. Its totient is φ = 1187899464.

The previous prime is 1286891069. The next prime is 1286891141. The reversal of 1286891099 is 9901986821.

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 1286891099 - 2¹⁶ = 1286825563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1286891099.

It is not an unprimeable number, because it can be changed into a prime (1286891029) 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, 49495799 + ... + 49495824.

It is an arithmetic number, because the mean of its divisors is an integer number (346470684).

Almost surely, 2^1286891099 is an apocalyptic number.

1286891099 is a deficient number, since it is larger than the sum of its proper divisors (98991637).

1286891099 is an equidigital number, since it uses as much as digits as its factorization.

1286891099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98991636.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1286891099 is about 35873.2644040098. The cubic root of 1286891099 is about 1087.7120313045.

The spelling of 1286891099 in words is "one billion, two hundred eighty-six million, eight hundred ninety-one thousand, ninety-nine".