855265819 has 2 divisors, whose sum is σ = 855265820. Its totient is φ = 855265818.

The previous prime is 855265813. The next prime is 855265891. The reversal of 855265819 is 918562558.

Together with next prime (855265891) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855265819 is a prime.

It is a super-2 number, since 2×855265819² = 1462959242299481522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855265813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427632909 + 427632910.

It is an arithmetic number, because the mean of its divisors is an integer number (427632910).

Almost surely, 2^855265819 is an apocalyptic number.

855265819 is a deficient number, since it is larger than the sum of its proper divisors (1).

855265819 is an equidigital number, since it uses as much as digits as its factorization.

855265819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 49.

The square root of 855265819 is about 29244.9280901834. The cubic root of 855265819 is about 949.2203461024.

The spelling of 855265819 in words is "eight hundred fifty-five million, two hundred sixty-five thousand, eight hundred nineteen".