612367221 has 4 divisors (see below), whose sum is σ = 816489632. Its totient is φ = 408244812.

The previous prime is 612367199. The next prime is 612367253. The reversal of 612367221 is 122763216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-612367221 is a prime.

It is a super-2 number, since 2×612367221² = 749987226710525682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612367271) 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, 102061201 + ... + 102061206.

It is an arithmetic number, because the mean of its divisors is an integer number (204122408).

Almost surely, 2^612367221 is an apocalyptic number.

It is an amenable number.

612367221 is a deficient number, since it is larger than the sum of its proper divisors (204122411).

612367221 is a wasteful number, since it uses less digits than its factorization.

612367221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204122410.

The product of its digits is 6048, while the sum is 30.

The square root of 612367221 is about 24746.0546552375. The cubic root of 612367221 is about 849.1882543302.

The spelling of 612367221 in words is "six hundred twelve million, three hundred sixty-seven thousand, two hundred twenty-one".