1265000161 has 8 divisors (see below), whose sum is σ = 1322147520. Its totient is φ = 1208031792.

The previous prime is 1265000147. The next prime is 1265000173. The reversal of 1265000161 is 1610005621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265000161 - 2⁵ = 1265000129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265010161) 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 7 ways as a sum of consecutive naturals, for example, 30190 + ... + 58663.

It is an arithmetic number, because the mean of its divisors is an integer number (165268440).

Almost surely, 2^1265000161 is an apocalyptic number.

It is an amenable number.

1265000161 is a deficient number, since it is larger than the sum of its proper divisors (57147359).

1265000161 is an equidigital number, since it uses as much as digits as its factorization.

1265000161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89495.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1265000161 is about 35566.8407509017. The cubic root of 1265000161 is about 1081.5091387927.

Adding to 1265000161 its reverse (1610005621), we get a palindrome (2875005782).

The spelling of 1265000161 in words is "one billion, two hundred sixty-five million, one hundred sixty-one", and thus it is an aban number.