1286647161 has 32 divisors (see below), whose sum is σ = 1811082240. Its totient is φ = 811675200.

The previous prime is 1286647151. The next prime is 1286647189. The reversal of 1286647161 is 1617466821.

1286647161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1286647161 - 2¹⁸ = 1286385017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1286647151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 539191 + ... + 541571.

It is an arithmetic number, because the mean of its divisors is an integer number (56596320).

Almost surely, 2^1286647161 is an apocalyptic number.

It is an amenable number.

1286647161 is a deficient number, since it is larger than the sum of its proper divisors (524435079).

1286647161 is a wasteful number, since it uses less digits than its factorization.

1286647161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557.

The product of its digits is 96768, while the sum is 42.

The square root of 1286647161 is about 35869.8642456310. The cubic root of 1286647161 is about 1087.6432994942.

The spelling of 1286647161 in words is "one billion, two hundred eighty-six million, six hundred forty-seven thousand, one hundred sixty-one".