1290140491 has 4 divisors (see below), whose sum is σ = 1290237984. Its totient is φ = 1290043000.

The previous prime is 1290140473. The next prime is 1290140497. The reversal of 1290140491 is 1940410921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1940410921 = 1193 ⋅1626497.

It is a cyclic number.

It is not a de Polignac number, because 1290140491 - 2¹³ = 1290132299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290140497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25060 + ... + 56641.

It is an arithmetic number, because the mean of its divisors is an integer number (322559496).

Almost surely, 2^1290140491 is an apocalyptic number.

1290140491 is a deficient number, since it is larger than the sum of its proper divisors (97493).

1290140491 is an equidigital number, since it uses as much as digits as its factorization.

1290140491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97492.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1290140491 is about 35918.5257353361. The cubic root of 1290140491 is about 1088.6267505479.

The spelling of 1290140491 in words is "one billion, two hundred ninety million, one hundred forty thousand, four hundred ninety-one".