1296355979 has 2 divisors, whose sum is σ = 1296355980. Its totient is φ = 1296355978.

The previous prime is 1296355903. The next prime is 1296355981. The reversal of 1296355979 is 9795536921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1296355979 is a prime.

It is a Sophie Germain prime.

Together with 1296355981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1296355079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648177989 + 648177990.

It is an arithmetic number, because the mean of its divisors is an integer number (648177990).

Almost surely, 2^1296355979 is an apocalyptic number.

1296355979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296355979 is an equidigital number, since it uses as much as digits as its factorization.

1296355979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4592700, while the sum is 56.

The square root of 1296355979 is about 36004.9438133154. The cubic root of 1296355979 is about 1090.3721701368.

The spelling of 1296355979 in words is "one billion, two hundred ninety-six million, three hundred fifty-five thousand, nine hundred seventy-nine".