545155561 has 2 divisors, whose sum is σ = 545155562. Its totient is φ = 545155560.

The previous prime is 545155531. The next prime is 545155571. The reversal of 545155561 is 165551545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535043161 + 10112400 = 23131^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 545155561 - 2⁷ = 545155433 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 545155561.

It is not a weakly prime, because it can be changed into another prime (545155531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272577780 + 272577781.

It is an arithmetic number, because the mean of its divisors is an integer number (272577781).

Almost surely, 2^545155561 is an apocalyptic number.

It is an amenable number.

545155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

545155561 is an equidigital number, since it uses as much as digits as its factorization.

545155561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75000, while the sum is 37.

The square root of 545155561 is about 23348.5665727042. The cubic root of 545155561 is about 816.9086264778.

The spelling of 545155561 in words is "five hundred forty-five million, one hundred fifty-five thousand, five hundred sixty-one".