612534221 has 8 divisors (see below), whose sum is σ = 673688064. Its totient is φ = 553385520.

The previous prime is 612534193. The next prime is 612534257. The reversal of 612534221 is 122435216.

It is a happy number.

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

It is not a de Polignac number, because 612534221 - 2¹⁸ = 612272077 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 (612530221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500645 + ... + 501866.

It is an arithmetic number, because the mean of its divisors is an integer number (84211008).

Almost surely, 2^612534221 is an apocalyptic number.

It is an amenable number.

612534221 is a deficient number, since it is larger than the sum of its proper divisors (61153843).

612534221 is a wasteful number, since it uses less digits than its factorization.

612534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002571.

The product of its digits is 2880, while the sum is 26.

The square root of 612534221 is about 24749.4287004771. The cubic root of 612534221 is about 849.2654419741.

Adding to 612534221 its reverse (122435216), we get a palindrome (734969437).

The spelling of 612534221 in words is "six hundred twelve million, five hundred thirty-four thousand, two hundred twenty-one".