855726749 has 2 divisors, whose sum is σ = 855726750. Its totient is φ = 855726748.

The previous prime is 855726701. The next prime is 855726761. The reversal of 855726749 is 947627558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560505625 + 295221124 = 23675^2 + 17182^2 .

It is a cyclic number.

It is not a de Polignac number, because 855726749 - 2²⁰ = 854678173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855726749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855726049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427863374 + 427863375.

It is an arithmetic number, because the mean of its divisors is an integer number (427863375).

Almost surely, 2^855726749 is an apocalyptic number.

It is an amenable number.

855726749 is a deficient number, since it is larger than the sum of its proper divisors (1).

855726749 is an equidigital number, since it uses as much as digits as its factorization.

855726749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 53.

The square root of 855726749 is about 29252.8075404738. The cubic root of 855726749 is about 949.3908371745.

The spelling of 855726749 in words is "eight hundred fifty-five million, seven hundred twenty-six thousand, seven hundred forty-nine".