851097697 has 4 divisors (see below), whose sum is σ = 851228676. Its totient is φ = 850966720.

The previous prime is 851097679. The next prime is 851097701. The reversal of 851097697 is 796790158.

It is a happy number.

851097697 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 an emirpimes, since its reverse is a distinct semiprime: 796790158 = 2 ⋅398395079.

It can be written as a sum of positive squares in 2 ways, for example, as 149059681 + 702038016 = 12209^2 + 26496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851097697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851097607) 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, 55204 + ... + 68917.

It is an arithmetic number, because the mean of its divisors is an integer number (212807169).

Almost surely, 2^851097697 is an apocalyptic number.

It is an amenable number.

851097697 is a deficient number, since it is larger than the sum of its proper divisors (130979).

851097697 is a wasteful number, since it uses less digits than its factorization.

851097697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130978.

The product of its (nonzero) digits is 952560, while the sum is 52.

The square root of 851097697 is about 29173.5787485869. The cubic root of 851097697 is about 947.6758317801.

The spelling of 851097697 in words is "eight hundred fifty-one million, ninety-seven thousand, six hundred ninety-seven".