1296349491 has 8 divisors (see below), whose sum is σ = 1756801744. Its totient is φ = 850065120.

The previous prime is 1296349487. The next prime is 1296349511. The reversal of 1296349491 is 1949436921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1296349491 - 2² = 1296349487 is a prime.

It is a super-3 number, since 3×1296349491³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1296349491.

It is not an unprimeable number, because it can be changed into a prime (1296349291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3541756 + ... + 3542121.

It is an arithmetic number, because the mean of its divisors is an integer number (219600218).

Almost surely, 2^1296349491 is an apocalyptic number.

1296349491 is a deficient number, since it is larger than the sum of its proper divisors (460452253).

1296349491 is an equidigital number, since it uses as much as digits as its factorization.

1296349491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083941.

The product of its digits is 419904, while the sum is 48.

The square root of 1296349491 is about 36004.8537144647. The cubic root of 1296349491 is about 1090.3703511029.

The spelling of 1296349491 in words is "one billion, two hundred ninety-six million, three hundred forty-nine thousand, four hundred ninety-one".