1286799361 has 4 divisors (see below), whose sum is σ = 1286871300. Its totient is φ = 1286727424.

The previous prime is 1286799341. The next prime is 1286799379. The reversal of 1286799361 is 1639976821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1639976821 = 7 ⋅234282403.

It can be written as a sum of positive squares in 2 ways, for example, as 633025600 + 653773761 = 25160^2 + 25569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286799361 - 2¹¹ = 1286797313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1286799299 and 1286799308.

It is not an unprimeable number, because it can be changed into a prime (1286799341) 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, 14025 + ... + 52633.

It is an arithmetic number, because the mean of its divisors is an integer number (321717825).

It is a Proth number, since it is equal to 19635 ⋅ 2¹⁶ + 1 and 19635 < 2¹⁶.

Almost surely, 2^1286799361 is an apocalyptic number.

It is an amenable number.

1286799361 is a deficient number, since it is larger than the sum of its proper divisors (71939).

1286799361 is an equidigital number, since it uses as much as digits as its factorization.

1286799361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71938.

The product of its digits is 979776, while the sum is 52.

The square root of 1286799361 is about 35871.9857409651. The cubic root of 1286799361 is about 1087.6861842851.

The spelling of 1286799361 in words is "one billion, two hundred eighty-six million, seven hundred ninety-nine thousand, three hundred sixty-one".