612208121 has 4 divisors (see below), whose sum is σ = 699666432. Its totient is φ = 524749812.

The previous prime is 612208111. The next prime is 612208147. The reversal of 612208121 is 121802216.

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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612208121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612208111) 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, 43729145 + ... + 43729158.

It is an arithmetic number, because the mean of its divisors is an integer number (174916608).

Almost surely, 2^612208121 is an apocalyptic number.

It is an amenable number.

612208121 is a deficient number, since it is larger than the sum of its proper divisors (87458311).

612208121 is an equidigital number, since it uses as much as digits as its factorization.

612208121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87458310.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 612208121 is about 24742.8397925541. The cubic root of 612208121 is about 849.1147050235.

The spelling of 612208121 in words is "six hundred twelve million, two hundred eight thousand, one hundred twenty-one".