858225869 has 4 divisors (see below), whose sum is σ = 858412380. Its totient is φ = 858039360.

The previous prime is 858225857. The next prime is 858225871. The reversal of 858225869 is 968522858.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968522858 = 2 ⋅484261429.

It can be written as a sum of positive squares in 2 ways, for example, as 543589225 + 314636644 = 23315^2 + 17738^2 .

It is a cyclic number.

It is not a de Polignac number, because 858225869 - 2⁴ = 858225853 is a prime.

It is a super-2 number, since 2×858225869² = 1473103284441610322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 858225869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858225769) 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, 86174 + ... + 95615.

It is an arithmetic number, because the mean of its divisors is an integer number (214603095).

Almost surely, 2^858225869 is an apocalyptic number.

It is an amenable number.

858225869 is a deficient number, since it is larger than the sum of its proper divisors (186511).

858225869 is a wasteful number, since it uses less digits than its factorization.

858225869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186510.

The product of its digits is 2764800, while the sum is 53.

The square root of 858225869 is about 29295.4922983042. The cubic root of 858225869 is about 950.3141598095.

The spelling of 858225869 in words is "eight hundred fifty-eight million, two hundred twenty-five thousand, eight hundred sixty-nine".