809253541 has 2 divisors, whose sum is σ = 809253542. Its totient is φ = 809253540.

The previous prime is 809253539. The next prime is 809253553. The reversal of 809253541 is 145352908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676520100 + 132733441 = 26010^2 + 11521^2 .

It is a cyclic number.

It is not a de Polignac number, because 809253541 - 2¹ = 809253539 is a prime.

Together with 809253539, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 809253541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809253521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404626770 + 404626771.

It is an arithmetic number, because the mean of its divisors is an integer number (404626771).

Almost surely, 2^809253541 is an apocalyptic number.

It is an amenable number.

809253541 is a deficient number, since it is larger than the sum of its proper divisors (1).

809253541 is an equidigital number, since it uses as much as digits as its factorization.

809253541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 809253541 is about 28447.3819709301. The cubic root of 809253541 is about 931.8833154250.

The spelling of 809253541 in words is "eight hundred nine million, two hundred fifty-three thousand, five hundred forty-one".