1212667265 has 4 divisors (see below), whose sum is σ = 1455200724. Its totient is φ = 970133808.

The previous prime is 1212667243. The next prime is 1212667271. The reversal of 1212667265 is 5627662121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5627662121 = 661 ⋅8513861.

It can be written as a sum of positive squares in 2 ways, for example, as 522396736 + 690270529 = 22856^2 + 26273^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212667265 - 2¹² = 1212663169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121266722 + ... + 121266731.

It is an arithmetic number, because the mean of its divisors is an integer number (363800181).

Almost surely, 2^1212667265 is an apocalyptic number.

It is an amenable number.

1212667265 is a deficient number, since it is larger than the sum of its proper divisors (242533459).

1212667265 is an equidigital number, since it uses as much as digits as its factorization.

1212667265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242533458.

The product of its digits is 60480, while the sum is 38.

The square root of 1212667265 is about 34823.3723955622. The cubic root of 1212667265 is about 1066.3846493477.

The spelling of 1212667265 in words is "one billion, two hundred twelve million, six hundred sixty-seven thousand, two hundred sixty-five".