1265487091 has 12 divisors (see below), whose sum is σ = 1397147976. Its totient is φ = 1145349920.

The previous prime is 1265487043. The next prime is 1265487103. The reversal of 1265487091 is 1907845621.

It is not a de Polignac number, because 1265487091 - 2²³ = 1257098483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265487011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4431 + ... + 50503.

It is an arithmetic number, because the mean of its divisors is an integer number (116428998).

Almost surely, 2^1265487091 is an apocalyptic number.

1265487091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1265487091 is a deficient number, since it is larger than the sum of its proper divisors (131660885).

1265487091 is a wasteful number, since it uses less digits than its factorization.

1265487091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46322 (or 46311 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1265487091 is about 35573.6853727583. The cubic root of 1265487091 is about 1081.6478875734.

The spelling of 1265487091 in words is "one billion, two hundred sixty-five million, four hundred eighty-seven thousand, ninety-one".