545191901 has 2 divisors, whose sum is σ = 545191902. Its totient is φ = 545191900.

The previous prime is 545191897. The next prime is 545191903. The reversal of 545191901 is 109191545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533563801 + 11628100 = 23099^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 545191901 - 2² = 545191897 is a prime.

It is a Sophie Germain prime.

Together with 545191903, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545191903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272595950 + 272595951.

It is an arithmetic number, because the mean of its divisors is an integer number (272595951).

Almost surely, 2^545191901 is an apocalyptic number.

It is an amenable number.

545191901 is a deficient number, since it is larger than the sum of its proper divisors (1).

545191901 is an equidigital number, since it uses as much as digits as its factorization.

545191901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 35.

The square root of 545191901 is about 23349.3447659672. The cubic root of 545191901 is about 816.9267777493.

The spelling of 545191901 in words is "five hundred forty-five million, one hundred ninety-one thousand, nine hundred one".