1290223281965 has 4 divisors (see below), whose sum is σ = 1548267938364. Its totient is φ = 1032178625568.

The previous prime is 1290223281911. The next prime is 1290223281967. The reversal of 1290223281965 is 5691823220921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160821852676 + 1129401429289 = 401026^2 + 1062733^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290223281965 - 2⁶ = 1290223281901 is a prime.

It is a super-2 number, since 2×1290223281965² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290223281967) 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, 129022328192 + ... + 129022328201.

It is an arithmetic number, because the mean of its divisors is an integer number (387066984591).

Almost surely, 2^{1290223281965} is an apocalyptic number.

It is an amenable number.

1290223281965 is a deficient number, since it is larger than the sum of its proper divisors (258044656399).

1290223281965 is an equidigital number, since it uses as much as digits as its factorization.

1290223281965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258044656398.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 1290223281965 in words is "one trillion, two hundred ninety billion, two hundred twenty-three million, two hundred eighty-one thousand, nine hundred sixty-five".