1286585161 has 3 divisors (see below), whose sum is σ = 1286621031. Its totient is φ = 1286549292.

The previous prime is 1286585159. The next prime is 1286585189. The reversal of 1286585161 is 1615856821.

The square root of 1286585161 is 35869.

It is a perfect power (a square), and thus also a powerful 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: 1615856821 = 1033 ⋅1564237.

It can be written as a sum of positive squares in only one way, i.e., 1160696761 + 125888400 = 34069^2 + 11220^2 .

It is not a de Polignac number, because 1286585161 - 2¹ = 1286585159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286585141) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17935 + ... + 53803.

It is an arithmetic number, because the mean of its divisors is an integer number (428873677).

Almost surely, 2^1286585161 is an apocalyptic number.

1286585161 is the 35869-th square number.

1286585161 is the 17935-th centered octagonal number.

It is an amenable number.

1286585161 is a deficient number, since it is larger than the sum of its proper divisors (35870).

1286585161 is an frugal number, since it uses more digits than its factorization.

1286585161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71738 (or 35869 counting only the distinct ones).

The product of its digits is 115200, while the sum is 43.

The cubic root of 1286585161 is about 1087.6258290305.

The spelling of 1286585161 in words is "one billion, two hundred eighty-six million, five hundred eighty-five thousand, one hundred sixty-one".