612248809 has 2 divisors, whose sum is σ = 612248810. Its totient is φ = 612248808.

The previous prime is 612248807. The next prime is 612248821. The reversal of 612248809 is 908842216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421891600 + 190357209 = 20540^2 + 13797^2 .

It is a cyclic number.

It is not a de Polignac number, because 612248809 - 2¹ = 612248807 is a prime.

Together with 612248807, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (612248801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306124404 + 306124405.

It is an arithmetic number, because the mean of its divisors is an integer number (306124405).

Almost surely, 2^612248809 is an apocalyptic number.

It is an amenable number.

612248809 is a deficient number, since it is larger than the sum of its proper divisors (1).

612248809 is an equidigital number, since it uses as much as digits as its factorization.

612248809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 612248809 is about 24743.6619965598. The cubic root of 612248809 is about 849.1335156276.

The spelling of 612248809 in words is "six hundred twelve million, two hundred forty-eight thousand, eight hundred nine".