1296970639 has 2 divisors, whose sum is σ = 1296970640. Its totient is φ = 1296970638.

The previous prime is 1296970553. The next prime is 1296970663. The reversal of 1296970639 is 9360796921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1296970639 - 2⁹ = 1296970127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1296970669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648485319 + 648485320.

It is an arithmetic number, because the mean of its divisors is an integer number (648485320).

Almost surely, 2^1296970639 is an apocalyptic number.

1296970639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296970639 is an equidigital number, since it uses as much as digits as its factorization.

1296970639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 1296970639 is about 36013.4785740006. The cubic root of 1296970639 is about 1090.5444742137.

The spelling of 1296970639 in words is "one billion, two hundred ninety-six million, nine hundred seventy thousand, six hundred thirty-nine".