222451643 has 4 divisors (see below), whose sum is σ = 223449408. Its totient is φ = 221453880.

The previous prime is 222451631. The next prime is 222451657. The reversal of 222451643 is 346154222.

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 222451643 - 2²⁶ = 155342779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222451043) 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, 498548 + ... + 498993.

It is an arithmetic number, because the mean of its divisors is an integer number (55862352).

Almost surely, 2^222451643 is an apocalyptic number.

222451643 is a deficient number, since it is larger than the sum of its proper divisors (997765).

222451643 is an equidigital number, since it uses as much as digits as its factorization.

222451643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997764.

The product of its digits is 11520, while the sum is 29.

The square root of 222451643 is about 14914.8128717728. The cubic root of 222451643 is about 605.9152351968.

The spelling of 222451643 in words is "two hundred twenty-two million, four hundred fifty-one thousand, six hundred forty-three".