225220551 has 4 divisors (see below), whose sum is σ = 300294072. Its totient is φ = 150147032.

The previous prime is 225220529. The next prime is 225220553. The reversal of 225220551 is 155022522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 225220551 - 2¹⁴ = 225204167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225220553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37536756 + ... + 37536761.

It is an arithmetic number, because the mean of its divisors is an integer number (75073518).

Almost surely, 2^225220551 is an apocalyptic number.

225220551 is a deficient number, since it is larger than the sum of its proper divisors (75073521).

225220551 is an equidigital number, since it uses as much as digits as its factorization.

225220551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75073520.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 225220551 is about 15007.3498992993. The cubic root of 225220551 is about 608.4188658784.

The spelling of 225220551 in words is "two hundred twenty-five million, two hundred twenty thousand, five hundred fifty-one".