1491438811 has 2 divisors, whose sum is σ = 1491438812. Its totient is φ = 1491438810.

The previous prime is 1491438803. The next prime is 1491438833. The reversal of 1491438811 is 1188341941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491438811 - 2³ = 1491438803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491438511) 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 as a sum of consecutive naturals, namely, 745719405 + 745719406.

It is an arithmetic number, because the mean of its divisors is an integer number (745719406).

Almost surely, 2^1491438811 is an apocalyptic number.

1491438811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491438811 is an equidigital number, since it uses as much as digits as its factorization.

1491438811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 40.

The square root of 1491438811 is about 38619.1508321972. The cubic root of 1491438811 is about 1142.5322827952.

The spelling of 1491438811 in words is "one billion, four hundred ninety-one million, four hundred thirty-eight thousand, eight hundred eleven".