225691947 has 16 divisors (see below), whose sum is σ = 360078880. Its totient is φ = 138887136.

The previous prime is 225691931. The next prime is 225691951. The reversal of 225691947 is 749196522.

It is not a de Polignac number, because 225691947 - 2⁴ = 225691931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225691927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321148 + ... + 321849.

It is an arithmetic number, because the mean of its divisors is an integer number (22504930).

Almost surely, 2^225691947 is an apocalyptic number.

225691947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

225691947 is a deficient number, since it is larger than the sum of its proper divisors (134386933).

225691947 is a wasteful number, since it uses less digits than its factorization.

225691947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643019 (or 643013 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 225691947 is about 15023.0471942279. The cubic root of 225691947 is about 608.8430520841.

The spelling of 225691947 in words is "two hundred twenty-five million, six hundred ninety-one thousand, nine hundred forty-seven".