545660989 has 2 divisors, whose sum is σ = 545660990. Its totient is φ = 545660988.

The previous prime is 545660963. The next prime is 545661001. The reversal of 545660989 is 989066545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544428889 + 1232100 = 23333^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 545660989 - 2⁷ = 545660861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545660959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272830494 + 272830495.

It is an arithmetic number, because the mean of its divisors is an integer number (272830495).

Almost surely, 2^545660989 is an apocalyptic number.

It is an amenable number.

545660989 is a deficient number, since it is larger than the sum of its proper divisors (1).

545660989 is an equidigital number, since it uses as much as digits as its factorization.

545660989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The square root of 545660989 is about 23359.3875989933. The cubic root of 545660989 is about 817.1610076258.

The spelling of 545660989 in words is "five hundred forty-five million, six hundred sixty thousand, nine hundred eighty-nine".