855955531 has 2 divisors, whose sum is σ = 855955532. Its totient is φ = 855955530.

The previous prime is 855955523. The next prime is 855955537. The reversal of 855955531 is 135559558.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855955531 - 2³ = 855955523 is a prime.

It is a super-2 number, since 2×855955531² = 1465319742098983922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855955537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427977765 + 427977766.

It is an arithmetic number, because the mean of its divisors is an integer number (427977766).

Almost surely, 2^855955531 is an apocalyptic number.

855955531 is a deficient number, since it is larger than the sum of its proper divisors (1).

855955531 is an equidigital number, since it uses as much as digits as its factorization.

855955531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 675000, while the sum is 46.

The square root of 855955531 is about 29256.7177072207. The cubic root of 855955531 is about 949.4754374595.

The spelling of 855955531 in words is "eight hundred fifty-five million, nine hundred fifty-five thousand, five hundred thirty-one".