1491054091 has 2 divisors, whose sum is σ = 1491054092. Its totient is φ = 1491054090.

The previous prime is 1491054079. The next prime is 1491054121. The reversal of 1491054091 is 1904501941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491054091 - 2²⁹ = 954183179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491054391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745527045 + 745527046.

It is an arithmetic number, because the mean of its divisors is an integer number (745527046).

Almost surely, 2^1491054091 is an apocalyptic number.

1491054091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491054091 is an equidigital number, since it uses as much as digits as its factorization.

1491054091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1491054091 is about 38614.1695624806. The cubic root of 1491054091 is about 1142.4340347551.

The spelling of 1491054091 in words is "one billion, four hundred ninety-one million, fifty-four thousand, ninety-one".