225451643 has 4 divisors (see below), whose sum is σ = 225484560. Its totient is φ = 225418728.

The previous prime is 225451631. The next prime is 225451649. The reversal of 225451643 is 346154522.

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 225451643 - 2¹⁰ = 225450619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225451649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1880 + ... + 21317.

It is an arithmetic number, because the mean of its divisors is an integer number (56371140).

Almost surely, 2^225451643 is an apocalyptic number.

225451643 is a deficient number, since it is larger than the sum of its proper divisors (32917).

225451643 is an equidigital number, since it uses as much as digits as its factorization.

225451643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32916.

The product of its digits is 28800, while the sum is 32.

The square root of 225451643 is about 15015.0472193730. The cubic root of 225451643 is about 608.6268881490.

The spelling of 225451643 in words is "two hundred twenty-five million, four hundred fifty-one thousand, six hundred forty-three".