855231291 has 20 divisors (see below), whose sum is σ = 1352720952. Its totient is φ = 536614848.

The previous prime is 855231271. The next prime is 855231323. The reversal of 855231291 is 192132558.

855231291 is a `hidden beast` number, since 8 + 5 + 523 + 129 + 1 = 666.

It is not a de Polignac number, because 855231291 - 2¹⁴ = 855214907 is a prime.

It is a super-2 number, since 2×855231291² = 1462841122211053362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (855231271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 309165 + ... + 311918.

Almost surely, 2^855231291 is an apocalyptic number.

855231291 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

855231291 is a deficient number, since it is larger than the sum of its proper divisors (497489661).

855231291 is a wasteful number, since it uses less digits than its factorization.

855231291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621112 (or 621103 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 855231291 is about 29244.3377596416. The cubic root of 855231291 is about 949.2075722488.

The spelling of 855231291 in words is "eight hundred fifty-five million, two hundred thirty-one thousand, two hundred ninety-one".