225616881 has 8 divisors (see below), whose sum is σ = 343797184. Its totient is φ = 128923920.

The previous prime is 225616871. The next prime is 225616901. The reversal of 225616881 is 188616522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225616881 - 2¹³ = 225608689 is a prime.

It is a super-2 number, since 2×225616881² = 101805953984336322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225616841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5371810 + ... + 5371851.

It is an arithmetic number, because the mean of its divisors is an integer number (42974648).

Almost surely, 2^225616881 is an apocalyptic number.

225616881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225616881 is a deficient number, since it is larger than the sum of its proper divisors (118180303).

225616881 is a wasteful number, since it uses less digits than its factorization.

225616881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10743671.

The product of its digits is 46080, while the sum is 39.

The square root of 225616881 is about 15020.5486251335. The cubic root of 225616881 is about 608.7755434274.

The spelling of 225616881 in words is "two hundred twenty-five million, six hundred sixteen thousand, eight hundred eighty-one".