545563691 has 2 divisors, whose sum is σ = 545563692. Its totient is φ = 545563690.

The previous prime is 545563673. The next prime is 545563727. The reversal of 545563691 is 196365545.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545563691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (545563591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272781845 + 272781846.

It is an arithmetic number, because the mean of its divisors is an integer number (272781846).

Almost surely, 2^545563691 is an apocalyptic number.

545563691 is a deficient number, since it is larger than the sum of its proper divisors (1).

545563691 is an equidigital number, since it uses as much as digits as its factorization.

545563691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 44.

The square root of 545563691 is about 23357.3048744927. The cubic root of 545563691 is about 817.1124348187.

The spelling of 545563691 in words is "five hundred forty-five million, five hundred sixty-three thousand, six hundred ninety-one".