2231161225 has 12 divisors (see below), whose sum is σ = 2767247116. Its totient is φ = 1784537280.

The previous prime is 2231161217. The next prime is 2231161259. The reversal of 2231161225 is 5221611322.

It can be written as a sum of positive squares in 6 ways, for example, as 4076361 + 2227084864 = 2019^2 + 47192^2 .

It is not a de Polignac number, because 2231161225 - 2³ = 2231161217 is a prime.

It is a super-3 number, since 3×2231161225³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 2231161225.

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, 174139 + ... + 186511.

Almost surely, 2^2231161225 is an apocalyptic number.

2231161225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2231161225 is a deficient number, since it is larger than the sum of its proper divisors (536085891).

2231161225 is a wasteful number, since it uses less digits than its factorization.

2231161225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19596 (or 19591 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 2231161225 is about 47235.1693656326. The cubic root of 2231161225 is about 1306.7032901008.

Adding to 2231161225 its reverse (5221611322), we get a palindrome (7452772547).

The spelling of 2231161225 in words is "two billion, two hundred thirty-one million, one hundred sixty-one thousand, two hundred twenty-five".