612500621 has 2 divisors, whose sum is σ = 612500622. Its totient is φ = 612500620.

The previous prime is 612500611. The next prime is 612500639. The reversal of 612500621 is 126005216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531302500 + 81198121 = 23050^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 612500621 - 2²² = 608306317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612500611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306250310 + 306250311.

It is an arithmetic number, because the mean of its divisors is an integer number (306250311).

Almost surely, 2^612500621 is an apocalyptic number.

It is an amenable number.

612500621 is a deficient number, since it is larger than the sum of its proper divisors (1).

612500621 is an equidigital number, since it uses as much as digits as its factorization.

612500621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 612500621 is about 24748.7498876206. The cubic root of 612500621 is about 849.2499131325.

Adding to 612500621 its reverse (126005216), we get a palindrome (738505837).

The spelling of 612500621 in words is "six hundred twelve million, five hundred thousand, six hundred twenty-one".