545693021 has 2 divisors, whose sum is σ = 545693022. Its totient is φ = 545693020.

The previous prime is 545693003. The next prime is 545693059. The reversal of 545693021 is 120396545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327067225 + 218625796 = 18085^2 + 14786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545693021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545693321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272846510 + 272846511.

It is an arithmetic number, because the mean of its divisors is an integer number (272846511).

Almost surely, 2^545693021 is an apocalyptic number.

It is an amenable number.

545693021 is a deficient number, since it is larger than the sum of its proper divisors (1).

545693021 is an equidigital number, since it uses as much as digits as its factorization.

545693021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 545693021 is about 23360.0732233441. The cubic root of 545693021 is about 817.1769972786.

The spelling of 545693021 in words is "five hundred forty-five million, six hundred ninety-three thousand, twenty-one".