1145541491 has 2 divisors, whose sum is σ = 1145541492. Its totient is φ = 1145541490.

The previous prime is 1145541479. The next prime is 1145541511. The reversal of 1145541491 is 1941455411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1145541491 - 2¹⁸ = 1145279347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1145541401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572770745 + 572770746.

It is an arithmetic number, because the mean of its divisors is an integer number (572770746).

Almost surely, 2^1145541491 is an apocalyptic number.

1145541491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145541491 is an equidigital number, since it uses as much as digits as its factorization.

1145541491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 1145541491 is about 33845.8489478400. The cubic root of 1145541491 is about 1046.3338479706. Note that the first 3 decimals are identical.

The spelling of 1145541491 in words is "one billion, one hundred forty-five million, five hundred forty-one thousand, four hundred ninety-one".