153872221 has 4 divisors (see below), whose sum is σ = 157625244. Its totient is φ = 150119200.

The previous prime is 153872183. The next prime is 153872237. The reversal of 153872221 is 122278351.

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 10208025 + 143664196 = 3195^2 + 11986^2 .

It is a cyclic number.

It is not a de Polignac number, because 153872221 - 2²¹ = 151775069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153872261) 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, 1876450 + ... + 1876531.

It is an arithmetic number, because the mean of its divisors is an integer number (39406311).

Almost surely, 2^153872221 is an apocalyptic number.

It is an amenable number.

153872221 is a deficient number, since it is larger than the sum of its proper divisors (3753023).

153872221 is an equidigital number, since it uses as much as digits as its factorization.

153872221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753022.

The product of its digits is 6720, while the sum is 31.

The square root of 153872221 is about 12404.5242149790. The cubic root of 153872221 is about 535.8625513106.

The spelling of 153872221 in words is "one hundred fifty-three million, eight hundred seventy-two thousand, two hundred twenty-one".