1331144491 has 2 divisors, whose sum is σ = 1331144492. Its totient is φ = 1331144490.

The previous prime is 1331144467. The next prime is 1331144533. The reversal of 1331144491 is 1944411331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331144491 - 2²¹ = 1329047339 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331144401) 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 as a sum of consecutive naturals, namely, 665572245 + 665572246.

It is an arithmetic number, because the mean of its divisors is an integer number (665572246).

Almost surely, 2^1331144491 is an apocalyptic number.

1331144491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331144491 is an equidigital number, since it uses as much as digits as its factorization.

1331144491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 1331144491 is about 36484.8528981549. The cubic root of 1331144491 is about 1100.0398032429.

The spelling of 1331144491 in words is "one billion, three hundred thirty-one million, one hundred forty-four thousand, four hundred ninety-one".