1296652649 has 4 divisors (see below), whose sum is σ = 1297635540. Its totient is φ = 1295669760.

The previous prime is 1296652631. The next prime is 1296652699. The reversal of 1296652649 is 9462566921.

It is a happy number.

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 1041675625 + 254977024 = 32275^2 + 15968^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296652649 - 2²⁸ = 1028217193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1296652597 and 1296652606.

It is not an unprimeable number, because it can be changed into a prime (1296652699) 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, 489464 + ... + 492105.

It is an arithmetic number, because the mean of its divisors is an integer number (324408885).

Almost surely, 2^1296652649 is an apocalyptic number.

It is an amenable number.

1296652649 is a deficient number, since it is larger than the sum of its proper divisors (982891).

1296652649 is an equidigital number, since it uses as much as digits as its factorization.

1296652649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982890.

The product of its digits is 1399680, while the sum is 50.

The square root of 1296652649 is about 36009.0634285314. The cubic root of 1296652649 is about 1090.4553407176.

The spelling of 1296652649 in words is "one billion, two hundred ninety-six million, six hundred fifty-two thousand, six hundred forty-nine".