1298220965 has 4 divisors (see below), whose sum is σ = 1557865164. Its totient is φ = 1038576768.

The previous prime is 1298220817. The next prime is 1298221003. The reversal of 1298220965 is 5690228921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5690228921 = 13 ⋅437709917.

It can be written as a sum of positive squares in 2 ways, for example, as 898140961 + 400080004 = 29969^2 + 20002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1298220965 - 2¹² = 1298216869 is a prime.

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, 129822092 + ... + 129822101.

It is an arithmetic number, because the mean of its divisors is an integer number (389466291).

Almost surely, 2^1298220965 is an apocalyptic number.

It is an amenable number.

1298220965 is a deficient number, since it is larger than the sum of its proper divisors (259644199).

1298220965 is an equidigital number, since it uses as much as digits as its factorization.

1298220965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259644198.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 1298220965 is about 36030.8335318516. The cubic root of 1298220965 is about 1090.8948029305.

The spelling of 1298220965 in words is "one billion, two hundred ninety-eight million, two hundred twenty thousand, nine hundred sixty-five".