855819001 has 2 divisors, whose sum is σ = 855819002. Its totient is φ = 855819000.

The previous prime is 855818993. The next prime is 855819017. The reversal of 855819001 is 100918558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843031225 + 12787776 = 29035^2 + 3576^2 .

It is a cyclic number.

It is not a de Polignac number, because 855819001 - 2³ = 855818993 is a prime.

It is not a weakly prime, because it can be changed into another prime (855819031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427909500 + 427909501.

It is an arithmetic number, because the mean of its divisors is an integer number (427909501).

Almost surely, 2^855819001 is an apocalyptic number.

It is an amenable number.

855819001 is a deficient number, since it is larger than the sum of its proper divisors (1).

855819001 is an equidigital number, since it uses as much as digits as its factorization.

855819001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 855819001 is about 29254.3843038954. The cubic root of 855819001 is about 949.4249524480.

The spelling of 855819001 in words is "eight hundred fifty-five million, eight hundred nineteen thousand, one".