1296190639 has 2 divisors, whose sum is σ = 1296190640. Its totient is φ = 1296190638.

The previous prime is 1296190633. The next prime is 1296190663. The reversal of 1296190639 is 9360916921.

It is a weak prime.

It is an emirp because it is prime and its reverse (9360916921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1296190639 - 2⁵ = 1296190607 is a prime.

It is a super-2 number, since 2×1296190639² = 3360220345262456642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1296190633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648095319 + 648095320.

It is an arithmetic number, because the mean of its divisors is an integer number (648095320).

Almost surely, 2^1296190639 is an apocalyptic number.

1296190639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296190639 is an equidigital number, since it uses as much as digits as its factorization.

1296190639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 1296190639 is about 36002.6476665259. The cubic root of 1296190639 is about 1090.3258120370.

The spelling of 1296190639 in words is "one billion, two hundred ninety-six million, one hundred ninety thousand, six hundred thirty-nine".