855511 has 2 divisors, whose sum is σ = 855512. Its totient is φ = 855510.

The previous prime is 855499. The next prime is 855521. The reversal of 855511 is 115558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855511 - 2⁹ = 854999 is a prime.

It is a super-2 number, since 2×855511² = 1463798142242, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427755 + 427756.

It is an arithmetic number, because the mean of its divisors is an integer number (427756).

2⁸⁵⁵⁵¹¹ is an apocalyptic number.

855511 is a deficient number, since it is larger than the sum of its proper divisors (1).

855511 is an equidigital number, since it uses as much as digits as its factorization.

855511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 25.

The square root of 855511 is about 924.9383763257. The cubic root of 855511 is about 94.9311042489.

The spelling of 855511 in words is "eight hundred fifty-five thousand, five hundred eleven".