538651221 has 8 divisors (see below), whose sum is σ = 718386240. Its totient is φ = 359008512.

The previous prime is 538651219. The next prime is 538651259. The reversal of 538651221 is 122156835.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 538651221 - 2¹ = 538651219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538651621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8065 + ... + 33798.

It is an arithmetic number, because the mean of its divisors is an integer number (89798280).

Almost surely, 2^538651221 is an apocalyptic number.

It is an amenable number.

538651221 is a deficient number, since it is larger than the sum of its proper divisors (179735019).

538651221 is a wasteful number, since it uses less digits than its factorization.

538651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46155.

The product of its digits is 14400, while the sum is 33.

The square root of 538651221 is about 23208.8608294332. The cubic root of 538651221 is about 813.6467290685.

The spelling of 538651221 in words is "five hundred thirty-eight million, six hundred fifty-one thousand, two hundred twenty-one".