1813226725 has 12 divisors (see below), whose sum is σ = 2290825476. Its totient is φ = 1423210880.

The previous prime is 1813226713. The next prime is 1813226731. The reversal of 1813226725 is 5276223181.

It is a Cunningham number, because it is equal to 42582²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 142134084 + 1671092641 = 11922^2 + 40879^2 .

It is not a de Polignac number, because 1813226725 - 2²⁷ = 1679008997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 682912 + ... + 685561.

It is an arithmetic number, because the mean of its divisors is an integer number (190902123).

Almost surely, 2^1813226725 is an apocalyptic number.

It is an amenable number.

1813226725 is a deficient number, since it is larger than the sum of its proper divisors (477598751).

1813226725 is a wasteful number, since it uses less digits than its factorization.

1813226725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368536 (or 1368531 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 1813226725 is about 42582.0000117421. Note that the first 4 decimals coincide. The cubic root of 1813226725 is about 1219.4126719229.

The spelling of 1813226725 in words is "one billion, eight hundred thirteen million, two hundred twenty-six thousand, seven hundred twenty-five".