1265306161 has 8 divisors (see below), whose sum is σ = 1455641984. Its totient is φ = 1077364800.

The previous prime is 1265306113. The next prime is 1265306167. The reversal of 1265306161 is 1616035621.

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 1265306161 - 2⁹ = 1265305649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265306167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597480 + ... + 599593.

It is an arithmetic number, because the mean of its divisors is an integer number (181955248).

Almost surely, 2^1265306161 is an apocalyptic number.

It is an amenable number.

1265306161 is a deficient number, since it is larger than the sum of its proper divisors (190335823).

1265306161 is a wasteful number, since it uses less digits than its factorization.

1265306161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197231.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1265306161 is about 35571.1422504254. The cubic root of 1265306161 is about 1081.5963364404.

The spelling of 1265306161 in words is "one billion, two hundred sixty-five million, three hundred six thousand, one hundred sixty-one".