1290978491 has 8 divisors (see below), whose sum is σ = 1409108400. Its totient is φ = 1172976640.

The previous prime is 1290978473. The next prime is 1290978497. The reversal of 1290978491 is 1948790921.

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

It is not a de Polignac number, because 1290978491 - 2¹⁴ = 1290962107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290978497) 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 in 7 ways as a sum of consecutive naturals, for example, 10286 + ... + 51843.

It is an arithmetic number, because the mean of its divisors is an integer number (176138550).

Almost surely, 2^1290978491 is an apocalyptic number.

1290978491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1290978491 is a deficient number, since it is larger than the sum of its proper divisors (118129909).

1290978491 is a wasteful number, since it uses less digits than its factorization.

1290978491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64029.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 1290978491 is about 35930.1891311471. The cubic root of 1290978491 is about 1088.8624023433.

The spelling of 1290978491 in words is "one billion, two hundred ninety million, nine hundred seventy-eight thousand, four hundred ninety-one".