855651019 has 2 divisors, whose sum is σ = 855651020. Its totient is φ = 855651018.

The previous prime is 855650977. The next prime is 855651047. The reversal of 855651019 is 910156558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855651019 - 2¹⁵ = 855618251 is a prime.

It is a super-2 number, since 2×855651019² = 1464277332631476722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855651079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427825509 + 427825510.

It is an arithmetic number, because the mean of its divisors is an integer number (427825510).

Almost surely, 2^855651019 is an apocalyptic number.

855651019 is a deficient number, since it is larger than the sum of its proper divisors (1).

855651019 is an equidigital number, since it uses as much as digits as its factorization.

855651019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 40.

The square root of 855651019 is about 29251.5131061626. The cubic root of 855651019 is about 949.3628299906.

The spelling of 855651019 in words is "eight hundred fifty-five million, six hundred fifty-one thousand, nineteen".