545490749 has 2 divisors, whose sum is σ = 545490750. Its totient is φ = 545490748.

The previous prime is 545490739. The next prime is 545490767. The reversal of 545490749 is 947094545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313537849 + 231952900 = 17707^2 + 15230^2 .

It is a cyclic number.

It is not a de Polignac number, because 545490749 - 2¹⁶ = 545425213 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545490739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272745374 + 272745375.

It is an arithmetic number, because the mean of its divisors is an integer number (272745375).

Almost surely, 2^545490749 is an apocalyptic number.

It is an amenable number.

545490749 is a deficient number, since it is larger than the sum of its proper divisors (1).

545490749 is an equidigital number, since it uses as much as digits as its factorization.

545490749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 545490749 is about 23355.7433835877. The cubic root of 545490749 is about 817.0760171509.

The spelling of 545490749 in words is "five hundred forty-five million, four hundred ninety thousand, seven hundred forty-nine".