545220491 has 2 divisors, whose sum is σ = 545220492. Its totient is φ = 545220490.

The previous prime is 545220461. The next prime is 545220563. The reversal of 545220491 is 194022545.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545220491 is a prime.

It is not a weakly prime, because it can be changed into another prime (545220461) 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, 272610245 + 272610246.

It is an arithmetic number, because the mean of its divisors is an integer number (272610246).

Almost surely, 2^545220491 is an apocalyptic number.

545220491 is a deficient number, since it is larger than the sum of its proper divisors (1).

545220491 is an equidigital number, since it uses as much as digits as its factorization.

545220491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 545220491 is about 23349.9569806884. The cubic root of 545220491 is about 816.9410574481.

The spelling of 545220491 in words is "five hundred forty-five million, two hundred twenty thousand, four hundred ninety-one".