221252545 has 4 divisors (see below), whose sum is σ = 265503060. Its totient is φ = 177002032.

The previous prime is 221252533. The next prime is 221252579. The reversal of 221252545 is 545252122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66324736 + 154927809 = 8144^2 + 12447^2 .

It is a cyclic number.

It is not a de Polignac number, because 221252545 - 2⁷ = 221252417 is a prime.

It is a super-3 number, since 3×221252545³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22125250 + ... + 22125259.

It is an arithmetic number, because the mean of its divisors is an integer number (66375765).

Almost surely, 2^221252545 is an apocalyptic number.

It is an amenable number.

221252545 is a deficient number, since it is larger than the sum of its proper divisors (44250515).

221252545 is an equidigital number, since it uses as much as digits as its factorization.

221252545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44250514.

The product of its digits is 8000, while the sum is 28.

The square root of 221252545 is about 14874.5603296366. The cubic root of 221252545 is about 604.8245694941.

The spelling of 221252545 in words is "two hundred twenty-one million, two hundred fifty-two thousand, five hundred forty-five".