1227081965 has 4 divisors (see below), whose sum is σ = 1472498364. Its totient is φ = 981665568.

The previous prime is 1227081943. The next prime is 1227081971. The reversal of 1227081965 is 5691807221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5691807221 = 751 ⋅7578971.

It can be written as a sum of positive squares in 2 ways, for example, as 415629769 + 811452196 = 20387^2 + 28486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227081965 - 2¹⁸ = 1226819821 is a prime.

It is a super-2 number, since 2×1227081965² = 3011460297656522450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122708192 + ... + 122708201.

It is an arithmetic number, because the mean of its divisors is an integer number (368124591).

Almost surely, 2^1227081965 is an apocalyptic number.

It is an amenable number.

1227081965 is a deficient number, since it is larger than the sum of its proper divisors (245416399).

1227081965 is an equidigital number, since it uses as much as digits as its factorization.

1227081965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245416398.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1227081965 is about 35029.7297306160. The cubic root of 1227081965 is about 1070.5933079527.

The spelling of 1227081965 in words is "one billion, two hundred twenty-seven million, eighty-one thousand, nine hundred sixty-five".