545321891 has 2 divisors, whose sum is σ = 545321892. Its totient is φ = 545321890.

The previous prime is 545321839. The next prime is 545321893. The reversal of 545321891 is 198123545.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 545321891 - 2²⁶ = 478213027 is a prime.

Together with 545321893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (545321893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272660945 + 272660946.

It is an arithmetic number, because the mean of its divisors is an integer number (272660946).

Almost surely, 2^545321891 is an apocalyptic number.

545321891 is a deficient number, since it is larger than the sum of its proper divisors (1).

545321891 is an equidigital number, since it uses as much as digits as its factorization.

545321891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 545321891 is about 23352.1281899531. The cubic root of 545321891 is about 816.9916991547.

The spelling of 545321891 in words is "five hundred forty-five million, three hundred twenty-one thousand, eight hundred ninety-one".