856031465 has 4 divisors (see below), whose sum is σ = 1027237764. Its totient is φ = 684825168.

The previous prime is 856031419. The next prime is 856031513. The reversal of 856031465 is 564130658.

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

It can be written as a sum of positive squares in 2 ways, for example, as 474063529 + 381967936 = 21773^2 + 19544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856031465 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85603142 + ... + 85603151.

It is an arithmetic number, because the mean of its divisors is an integer number (256809441).

Almost surely, 2^856031465 is an apocalyptic number.

It is an amenable number.

856031465 is a deficient number, since it is larger than the sum of its proper divisors (171206299).

856031465 is a wasteful number, since it uses less digits than its factorization.

856031465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171206298.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 856031465 is about 29258.0153974941. The cubic root of 856031465 is about 949.5035134258.

The spelling of 856031465 in words is "eight hundred fifty-six million, thirty-one thousand, four hundred sixty-five".