1265691085 has 16 divisors (see below), whose sum is σ = 1543594752. Its totient is φ = 996105600.

The previous prime is 1265691083. The next prime is 1265691101. The reversal of 1265691085 is 5801965621.

It is not a de Polignac number, because 1265691085 - 2¹ = 1265691083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265691083) 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 15 ways as a sum of consecutive naturals, for example, 169225 + ... + 176545.

It is an arithmetic number, because the mean of its divisors is an integer number (96474672).

Almost surely, 2^1265691085 is an apocalyptic number.

It is an amenable number.

1265691085 is a deficient number, since it is larger than the sum of its proper divisors (277903667).

1265691085 is an equidigital number, since it uses as much as digits as its factorization.

1265691085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7884.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 1265691085 is about 35576.5524608555. The cubic root of 1265691085 is about 1081.7060042795.

The spelling of 1265691085 in words is "one billion, two hundred sixty-five million, six hundred ninety-one thousand, eighty-five".