855905291 has 2 divisors, whose sum is σ = 855905292. Its totient is φ = 855905290.

The previous prime is 855905269. The next prime is 855905311. The reversal of 855905291 is 192509558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855905291 - 2¹⁴ = 855888907 is a prime.

It is a super-3 number, since 3×855905291³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (855905221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427952645 + 427952646.

It is an arithmetic number, because the mean of its divisors is an integer number (427952646).

Almost surely, 2^855905291 is an apocalyptic number.

855905291 is a deficient number, since it is larger than the sum of its proper divisors (1).

855905291 is an equidigital number, since it uses as much as digits as its factorization.

855905291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 44.

The square root of 855905291 is about 29255.8590883946. The cubic root of 855905291 is about 949.4568607237.

The spelling of 855905291 in words is "eight hundred fifty-five million, nine hundred five thousand, two hundred ninety-one".