855437549 has 2 divisors, whose sum is σ = 855437550. Its totient is φ = 855437548.

The previous prime is 855437537. The next prime is 855437581. The reversal of 855437549 is 945734558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662032900 + 193404649 = 25730^2 + 13907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855437549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855437497 and 855437506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855430549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427718774 + 427718775.

It is an arithmetic number, because the mean of its divisors is an integer number (427718775).

Almost surely, 2^855437549 is an apocalyptic number.

It is an amenable number.

855437549 is a deficient number, since it is larger than the sum of its proper divisors (1).

855437549 is an equidigital number, since it uses as much as digits as its factorization.

855437549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 50.

The square root of 855437549 is about 29247.8640074792. The cubic root of 855437549 is about 949.2838736036.

The spelling of 855437549 in words is "eight hundred fifty-five million, four hundred thirty-seven thousand, five hundred forty-nine".