612628309 has 2 divisors, whose sum is σ = 612628310. Its totient is φ = 612628308.

The previous prime is 612628301. The next prime is 612628319. The reversal of 612628309 is 903826216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546156900 + 66471409 = 23370^2 + 8153^2 .

It is a cyclic number.

It is not a de Polignac number, because 612628309 - 2³ = 612628301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612628301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306314154 + 306314155.

It is an arithmetic number, because the mean of its divisors is an integer number (306314155).

Almost surely, 2^612628309 is an apocalyptic number.

It is an amenable number.

612628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

612628309 is an equidigital number, since it uses as much as digits as its factorization.

612628309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 612628309 is about 24751.3294390423. The cubic root of 612628309 is about 849.3089234065.

The spelling of 612628309 in words is "six hundred twelve million, six hundred twenty-eight thousand, three hundred nine".