1267485605 has 4 divisors (see below), whose sum is σ = 1520982732. Its totient is φ = 1013988480.

The previous prime is 1267485601. The next prime is 1267485647. The reversal of 1267485605 is 5065847621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5065847621 = 19 ⋅266623559.

It can be written as a sum of positive squares in 2 ways, for example, as 708304996 + 559180609 = 26614^2 + 23647^2 .

It is not a de Polignac number, because 1267485605 - 2² = 1267485601 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 (1267485601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126748556 + ... + 126748565.

It is an arithmetic number, because the mean of its divisors is an integer number (380245683).

Almost surely, 2^1267485605 is an apocalyptic number.

It is an amenable number.

1267485605 is a deficient number, since it is larger than the sum of its proper divisors (253497127).

1267485605 is an equidigital number, since it uses as much as digits as its factorization.

1267485605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253497126.

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 1267485605 is about 35601.7640714614. The cubic root of 1267485605 is about 1082.2169837245.

The spelling of 1267485605 in words is "one billion, two hundred sixty-seven million, four hundred eighty-five thousand, six hundred five".