1286927161 has 4 divisors (see below), whose sum is σ = 1385921572. Its totient is φ = 1187932752.

The previous prime is 1286927129. The next prime is 1286927167. The reversal of 1286927161 is 1617296821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 655360000 + 631567161 = 25600^2 + 25131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286927161 - 2⁵ = 1286927129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286927167) 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, 49497186 + ... + 49497211.

It is an arithmetic number, because the mean of its divisors is an integer number (346480393).

Almost surely, 2^1286927161 is an apocalyptic number.

It is an amenable number.

1286927161 is a deficient number, since it is larger than the sum of its proper divisors (98994411).

1286927161 is an equidigital number, since it uses as much as digits as its factorization.

1286927161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98994410.

The product of its digits is 72576, while the sum is 43.

The square root of 1286927161 is about 35873.7670310772. The cubic root of 1286927161 is about 1087.7221913729.

The spelling of 1286927161 in words is "one billion, two hundred eighty-six million, nine hundred twenty-seven thousand, one hundred sixty-one".