855184009 has 2 divisors, whose sum is σ = 855184010. Its totient is φ = 855184008.

The previous prime is 855183961. The next prime is 855184049. The reversal of 855184009 is 900481558.

It is an a-pointer prime, because the next prime (855184049) can be obtained adding 855184009 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833765625 + 21418384 = 28875^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 855184009 - 2¹³ = 855175817 is a prime.

It is not a weakly prime, because it can be changed into another prime (855184049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427592004 + 427592005.

It is an arithmetic number, because the mean of its divisors is an integer number (427592005).

Almost surely, 2^855184009 is an apocalyptic number.

It is an amenable number.

855184009 is a deficient number, since it is larger than the sum of its proper divisors (1).

855184009 is an equidigital number, since it uses as much as digits as its factorization.

855184009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 855184009 is about 29243.5293526619. The cubic root of 855184009 is about 949.1900794138.

The spelling of 855184009 in words is "eight hundred fifty-five million, one hundred eighty-four thousand, nine".