855415831 has 4 divisors (see below), whose sum is σ = 855650664. Its totient is φ = 855181000.

The previous prime is 855415819. The next prime is 855415859. The reversal of 855415831 is 138514558.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855415831 - 2⁷ = 855415703 is a prime.

It is a super-2 number, since 2×855415831² = 1463472487850841122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855415801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111865 + ... + 119266.

It is an arithmetic number, because the mean of its divisors is an integer number (213912666).

Almost surely, 2^855415831 is an apocalyptic number.

855415831 is a deficient number, since it is larger than the sum of its proper divisors (234833).

855415831 is a wasteful number, since it uses less digits than its factorization.

855415831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234832.

The product of its digits is 96000, while the sum is 40.

The square root of 855415831 is about 29247.4927301470. The cubic root of 855415831 is about 949.2758400066.

The spelling of 855415831 in words is "eight hundred fifty-five million, four hundred fifteen thousand, eight hundred thirty-one".