1265041085 has 72 divisors (see below), whose sum is σ = 1961356320. Its totient is φ = 780373440.

The previous prime is 1265041079. The next prime is 1265041093. The reversal of 1265041085 is 5801405621.

It is not a de Polignac number, because 1265041085 - 2⁴ = 1265041069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4120502 + ... + 4120808.

It is an arithmetic number, because the mean of its divisors is an integer number (27241060).

Almost surely, 2^1265041085 is an apocalyptic number.

It is an amenable number.

1265041085 is a deficient number, since it is larger than the sum of its proper divisors (696315235).

1265041085 is a wasteful number, since it uses less digits than its factorization.

1265041085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1265041085 is about 35567.4160573973. The cubic root of 1265041085 is about 1081.5208012952.

It can be divided in two parts, 12650 and 41085, that added together give a palindrome (53735).

The spelling of 1265041085 in words is "one billion, two hundred sixty-five million, forty-one thousand, eighty-five".