856054997 has 4 divisors (see below), whose sum is σ = 978348576. Its totient is φ = 733761420.

The previous prime is 856054967. The next prime is 856054999. The reversal of 856054997 is 799450658.

856054997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 856054997 - 2¹² = 856050901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856054999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61146779 + ... + 61146792.

It is an arithmetic number, because the mean of its divisors is an integer number (244587144).

Almost surely, 2^856054997 is an apocalyptic number.

It is an amenable number.

856054997 is a deficient number, since it is larger than the sum of its proper divisors (122293579).

856054997 is a wasteful number, since it uses less digits than its factorization.

856054997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122293578.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 856054997 is about 29258.4175409402. The cubic root of 856054997 is about 949.5122138506.

The spelling of 856054997 in words is "eight hundred fifty-six million, fifty-four thousand, nine hundred ninety-seven".